International Conference on Complex Analysis and Applications, Bulgaria Sofia-Varna; 1985,1991;

International Conference on Different Aspects of Differentiability, Warsaw, Poland, 1993;

International Conference on Analytic Computations ISSAC'91, Bonn, Germany;

Annual Meetings of Mathematical Society of Japan, March 1994, Kobe; September 1994-Tokyo.

Special Functions Day, University of Amsterdam, Holland, December 2, 1997;

33'd Dutch's Mathematical Congress, Enschede, Holland, April 17, 1998;

Scientific Seminar at the University of Coimbra, Portugal, July 6, 2001.

Title of lecture: On the index transformations of the Kontorovich-Lebedev type;

Scientific Seminar at the University of Aveiro, Portugal, November 15, 2001.

Title of lecture: Index transformations associated with Bessel’s and Lommel’s functions;

Open Day of the Center of Mathematics of the University of Porto, November 23, 2001. Title of presentation: Integral transformations of the Kontorovich-Lebedev type;

Scientific Seminar at the Instituto Superior Tecnico, Lisbon, Portugal, July 19, 2002.

Title of lecture: On the new developments of the Kontorovich-Lebedev type

transformations;

Meeting on the Project “Erasmus”: Carlos III University of Madrid, Spain, March 27-30, 2003;

Scientific Seminar at the University of Coimbra, June 13, 2003. Title of lecture: L_p-boundedness

of a class of integral transforms with respect to parameters of hypergeometric kernels;

Summer School “Orthogonal Polynomials and Special Functions” at the University of Coimbra, Portugal,

July 14-26, 2003. Title of mini-course: Integral Transforms of the Hypergeometric Functions;

Scientific Seminar at the University of La Laguna (Tenerife, Canary Islands, Spain), November 19-24, 2004.

Title of lecture: On The Hausdorff-Young and Riesz-Kolmogorov theorems for the Kontorovich-Lebedev transform and its convolution;

8^th Annual Workshop on “Applications and Generalizations of Complex Analysis” at the University of Aveiro, Portugal, June 4, 2005. Title of lecture: Least values of Lp-norms for the Kontorovich-Lebedev transform and its convolution;

Conference on Operator Theory, Function Spaces and Applications, University of Aveiro, July 7-9, 2005. Title of lecture: L_p-boundedness of general index transforms;

5^th International ISAAC Congress, Catania, Italy, July 25-30, 2005. Title of presentation: The Kontorovich-Lebedev transformation on Sobolev type spaces;

Scientific visit of the Jacques-Louis Lions laboratory at the University of Pierre and Marie Curie, Paris, France, September 4-7, 2005;

Open Day of the Center of Mathematics of the University of Porto, November 25, 2005. Title of presentation: L_p-theorems for one class of

Integral transformations;