

Colloquia and invited lectures
The multidimensional fractional integrodifferentiation and the GrunwaldLetnikov approach to fractional calculus. Intern. Conference "Fractional calculus and its Applications", Tokyo, Japan, College of Engineering, Nihon University, May 1989. 
Methods of inversion of potential type operators. Free University of Berlin, Germany, Seminar of Prof. R.Gorenflo, June 1991. 
Inversion theorems for potential type operators. Intern. Conference "Potential Theory", Nagoya, Japan, August 1991. 
Inversion of potential type operators by means of hypersingular integrals. University of Maryland at College Park, USA, Seminar of Prof. J.Horvath, March 1993 
Approach to hypersingular integrals via fractional order differences. University of Maryland at College Park, Colloqium, March 1993. 
Hypersingular integrals and differences of fractional order. Yale University, New Haven, USA, Seminar on Mathematical Analysis and Applied Mathematics, April 1993. 
A generalization of the direct products of distributions generated by real matrices. College of William and Mary, Williamsburg, USA, Colloqium of Mathematics Department, May 1993 (invited by Prof. I.Spitkovsky) 
Hypersingular integrals as inverses to potential type operators. Rutgers University, New Brunswick, USA, Seminar of Prof. R.Wheeden, October, 1993. 
Differentiaition and integartion of variable order and the spaces L^{p(x)} . Intern. Conference Operator Theory for Complex and Hypercomplex Analysis", 1217 December 1994, Mexico City, Mexico. 
Hypersingular integrals and potential type operators, March 1995, Instituto Superior Tecnico, Math. Dept. (Invited by Prof. Francisco Teixeira). 
The spaces L^{p(x)} of variable order,November 1995, Free University of Berlin, Institute of Mathematics (invited by Prof. R.Gorenflo) 
Inversion of potential type operators, December 1995, Technische Hochschule Darmstadt, Germany, Colloquia (Invited by Prof. E.Meister). 
Hypersingular integrals with homogeneous characteristics, December 1995, Johann Wolfgang Goethe University, Frankfurt on Main, Germany,Colloquia (invited by Prof. F.Penzel). 
On some trends in the theory of hypersingular integrals, December 1995, Technische Universitat Chemnitz, Germany, Seminar of Prof. A.Bottcher. 
On multidimensional integral equations of the first kind, December 1995, Technische Universitat Freiberg, Germany, Colloquia (invited by Prof. L. von Wolfersdorf). 
Convolution Operators in the spaces with variable summability, Workshop on Operator Factorization and Applications, Instituto Superior Tecnico, Centro de Matematica Aplicada, February, 1997. 
Equations with Involutive Operators Abstract Theory Instituto Superior Tecnico, Centro de Matematica Aplicada, April 1997. 
Uniform boundedeness of dilation convolution operators in the spaces L^{p(x)} , University of Strathclyde, Glasgow, May 1997. 
Denseness of in the generalized Sobolev spaces, Conference on Analys and Applications, University of Wales, Gregynog, May 1997. 
Convolution operators in the generalized Sobolev spaces, University of Bath (England), May 1997. 
Convolution operators in the spaces of functions with variable summability, Congress of ISAAC , University of Delaware, USA, June 1997. 
Regularization of Convolution type equations of the first kind on the unit sphere. Workshop on Operator Factorization and Applications, Universidade do Algarve, October, 1998. 
Fractional powers of operators via hypersingular integrals, 1st International Conference on Semigroups of Operators: Theory and Applications, Newport Beach, California, 1418 December, 1998. 
Hypersingular integrals and their applications, Universidad de La Laguna, Tenerife, Spain, April 15, 1999. 
Local integrability of Riesz potentials, 2nd Congress of ISAAC, Fukuoka, Japan, August 16  August 21, 1999. 
Multidimensional integral equations of convolution type with shift, MexicoCity, CINVESTAV, April 10, 2000. 
Denseness of infinitely differentiable funtions in the generalized Sobolev spaces with variable order of integrability, Universidade do Aveiro, Portugal, May 26, 2000. 
Dilatation convolution operators and denseness of infinitely differentiable functions with compact support in the generalized Sobolev spaces, 8th Mathematical Conference of Bielorussia, Minsk, June 21, 2000. 
Fractional powers of operators via hypersingular integrals, IWOTAPortugal, 1215 de Setembro de 2000, Universidade do Algarve. 
Denseness of nice functions in Sobolev spaces with variable order of integrability, Sussex University (Reino Unido), Departamento de Matemática, 30 de Outubro de 2000. 
Denseness of infinitely differentiable functions with compact support in generalized Sobolev spaces, University of Cardiff, Departamento de Matemática, 1 de Novembro de 2000. 
Semigroup of operators of Bessel differentiation in the theory of convolution equations with discontinuous symbols, Second International Conference on Semigroups of Operators, Theory and Applications, RiodeJaneiro, Brasil, Setembro 1014, 2001. 
The Singular Type Operators in the Lebesgue Spaces with Variable Exponent, Instituto Superior Técnico, CEMAT, Lisboa, March 22, 2002. 
Sonine Integral Equations of the First Kind, Instituto Superior Tecnico, CEMAT, Lisboa, November 15, 2002. 
Periodization of TwoDimensional Fractional Riesz Operators, Instituto Superior Técnico, CEMAT, Lisboa, November 29, 2002. 
Operadores singulares em espacos generalizados de Lebesgue com expoente variavel, Universidade da Beira Interior, Covilha, January 28, 2003. 
A Further Progress in the Theory of Lebesgue Spaces with Variable Exponent: Singular Integral Equations and Sobolev Theorem for Potentials, Instituto Superior Tecnico, CEMAT, Lisboa, February 28, 2003. 
Generalized Lebesgue spaces with variable exponent, minicurso apresentado em Universidade de Aveiro, 1014 de Marco de 2003. 
Singular integral operators in the spaces with nonstandard growth, 6th Annual Workshop on Applications and generalizations of complex Analysis, Universidade do Aveiro, 15 de Marco de 2003. 
On a recent progress in the operator theory in Lebesgue spaces with variable exponents, Workshop on Operator Theory and Related topics, Rostov State University, RostovnaDonu, Russia, August, 2003. 
Operator theory in spaces of function with nonstandard growth, AMADE2003, Minsk, Minsk, Belarus, September 411, 2003. 
A progress in the theory of Lebesgue spaces with variable exponents: singular operators and Sobolev theorem for potentials, Seminario de Analise, Centro de Matematica da Universidade de Coimbra, 28 de Novembro de 2003. 
HardyLittlewoodSteinWeiss Inequality in the Lebesgue Spaces with Variable Exponent, Instituto Superior Tecnico, CEMAT, Lisboa, February 4, 2004. 
HardyLittlewoodSteinWeiss Inequality in the Lebesgue Spaces with Variable Exponent, Conference FSDONA 2004, "Function Spaces, Differential Operators, and Nonlinear Analysis", Czech Republick, Svratka, May 27June 2, 2004. 
Maximal and potential operators in function spaces with nonstandard growth, Conference IWOTA 2004  "International Workshop on Operator Theory and Applications", UK, NewcastleuponTyne, July 1216, 2004. 
Introduction to FDA04, 1st IFAC Workshop on Fractional Differentiation and its Applications, Bordeaux, France, July 1921, 2004. 
Boundary Value Problems for Analytic Functions and Singular Operators in the Variable Exponent Spaces with General Weights, Instituto Superior Tecnico, CEMAT, Lisboa, September 17, 2004 
On some classical operators in variable Lebesgue spaces, Intern. Conf. "Function Spaces, Approximation Theory, Nonlinear Analysis" dedicated to the centennial of S.M.Nikolskii, Steklov Institute of Math, Moscow, Russia, May 2329, 2005 
Classical operators (singular operators, maximal functions and potentials) in the variable exponent spaces, Intern. Conf. on Operator Theory, Function Spaces and Applications, dedicated to the 60th birthday of FrankOlme Speck, University of Aveiro, Aveiro, July 79, 2005. 
Maximal and singular operators on Carleson curves in the variable exponent setting, 5th Congress of ISAAC (International Society for Analysis, its Applications and Computation), July 2530, 2005, University of Catania, Catania, Sicily, Italy. 
Singular operators on Carleson curves in variable exponent Lebesgue spaces, Seminar "Linear Operators in Function Spaces", Rostov State University, RostovnaDonu, Russia, October 17, 2005. 
Integral operators with homogeneous kernel in the generalized Lebesgue spaces, Graduiertenkolleg, Abteilung fur Angewandte Mathematik, Universitat Freiburg, Germany, October 25, 2005. 
Fractional integrodifferentiation of functions of several variables, Instituto Politecnico Nacional, Escola Superior de Ingenieria Mecanica e Electrica, Mexico City, Mexico, November 17, 2005. 
Maximal and singular operators in variable exponent spaces. Workshop "Analisis: Norte Sur 2005", Cuernavaca, Mexico, November 23, 2005. 
Modern trends in the variable exponent spaces. 4th Intern. Symposium "Fourier Series and Applicatons", Novorossiisk, Russia, 2006, May 29  June 5. 
On solvability of singular integral equations in spaces with variable order of integrability. Sixth Intern. Conf. ICNPAA2006 on Math. Problems in Engineering and Aerospace Sciences, Budapest Univ. Techn. and Economics, Budapest, Hungary, June 2123, 2006. 
Periodization of fractional Integrals. 2nd IFAC Workshop on Fractional Differentiation and its Applications, Porto, Portugal, 19  21 July, 2006. 
Classical Operators of Analysis  Maximal, Singular and Potential Operators  in Variable Exponent Spaces. WOAT 2006, Instituto Superior Tecnico, Lisbon, Portugal, September 15. 
On variable exponent analysis on homogeneous spaces, Seminar on Functional Analysis and Applications, Departamento de Matematica, IST, April 20, 2007 
On weighted estimates of maximal, singular and potential operators in variable exponent space, INTAS Workshop "Variable Exponent Analysis", Baku, Azerbaija, 1617 of May 2007 
Weighted estimates for the maximal operator in the variable exponent spaces on metric measure spaces, 6 Congresso de ISAAC (International Society for Analysis, Applications and Computation), Ankara, Turkey, 1318 de Agosto, 2007 
Classical operators of harmonic analysis in Lorentz spaces with variable exponent, Seminar on Functional Analysis and Applications, Departamento de Matematica, IST, October 12, 2007 
On generalized potential operators in variable exponent spaces. Seminar on Math Analysis and Function Theory, A.Razmadze Math Inst., Tbilisi, October 23, 2007 
Classical operators of harmonic analysis in Lorentz spaces with variable exponent, Universidade do Aveiro, April 17, 2008 
Generalized potential operators in variable exponent spaces, Seminar on Functional Analysis and Applications, Departamento de Matematica, IST, April 19, 2008 
Weighted Estimations of Classical Operators of Harmonic Analysis in Variable Exponent Setting, XVI Intern. Conf. "Mathematics, Economics, Education" and Vth Intern. Symposium: Fourier series and Applications May 27  June 03, 2008 
Variable Exponent Spaces: Boundedness of Maximal Singular and Potential Operators, Universitata degli Studi di Padova, Dipartamento de Matematica Pura e Aplicata, June 23, 2008. 
On an equivalent reformulation of the Possio integral equation as a problem of matrix factorization. 7th Intern. Conf. on Math. Probl.in Engineering, Aerospace and Sciences, June 2527, 2008 University of Genoa, Italy. 
Weighted Estimates of Classical Operators of Harmonic Analysis in Variable Exponent Spaces, Intern. Conf. "Analysis, PDEs and Applications" (on the occasion of V. Mazya's 70th birthday), University "La Sapienza", Rome, June 30  July 3, 2008. 
Selected Topics of the Operator Theory in Variable Exponent Spaces. FSDONA Workshop, Helsinki (Finland), August 2224, 2008 
Maximal and potential operators in variable exponent Morrey spaces, Intern. Workshop on Variable Expon. Anal. and Related Topics, A.Razmadze Inst. and Georgian Techn. Univ., Sept. 25, 2008 
On Variable Exponent Trends in Fractional Calculus. “Fractional Flows Workshop”, Univ. of Warwick, Coventry, UK, September 18 –19, 2008. 
Weighted Estimations in Variable Exponent Analysis on Metric Measure Spaces, II Iberian Mathematical Meeting, Universidad de Extremadura, Badajoz, October 35, 2008 
Maximal and potential operators in variable exponent Morrey spaces Congress “Nonlinear DE and Appl.”, June 22 25, 2009, Catania. 
Fractional integrals of variable degenerating order in variable order Holder spaces on homogeneous spaces, ISAAC2009, London, July 1318 of 2009 
Hypersingular integrals and their application. Seminar of the Department of Mathematics, Mechanics and Computer Siceinces of the Federal Southern University of Russia, September 03 and September 10, 2009. 
Maximal, singular and potential operators in generalized variable exponent Morrey spaces. Seminar on Functional Analysis and Applications, Departamento de Matematica, IST, September 18, 2009 
A class of integral equations of the first kind, Seminar of the Math Dept of the Southern Federal University of Russia, April, 2010. 
Selected Topics of the Operator Theory in Variable Exponent Spaces, Rostov Mathematical Society, in the Southern Federal University, Russia, April 22, 2010. 
On potentials in generalized Holder spaces over uniform domains, Seminar "Functional Analysis and Applications", CEAF, IST, May 14. 2010. 
Boundedness of weighted singular integral operators on Carleson curves in Grand Lebesgue spaces, SessionWorkshop “Analysis, Inequalities and Homogenization Theory and Applications" of ICNAAM2010, September of 2010. 
Grand Lebesgue spaces on sets of infinite measure, Summer School and Workshop ”New Function Spaces in PDEs and Harmonic Analysis”, June 1, 2011 . 
Spherical fractional integrals and their application to a problem of aerodynamics, Workshop on Fractional Calculus, Swansea, June 17, 2011. 
On potentials in generalized Holder spaces over uniform domains in Rn, IWOTA2011, July 39, Seville, 2011. 
Grand Lebesgue spaces, 6th International Conference AMADE2011 dedicated to the memory of A. A. Kilbas, September 1218, 2011. 
Classical operators of Harmonic Analysis in variable exponent Morrey type spaces, 8th International Conference FSDONA 2011, September 18–24, 2011. 
Grand Lebesgue spaces, International Conference on on Spaces, Weights and Variable Exponent Analysis, 2011, Barcelona, September 2631. 
