-"Charge and magnetization plateaux in strongly correlated systems",

Departamento de Fisica Terica I, Universidad Madrid, September 10, 2004, Madrid-Spain.

- "Charge and magnetization plateaux in strongly correlated systems",

11th regional conference on mathematical physics and IPM spring conference, May 3-6, 2004, Tehran-Iran.

- "Coherent motion in cold glasses in terms of XY interaction",

July 16-21, 2003. Workshop on: Collective Phenomena in the Low Temperature Physics of Glasses,

Max-Planck institute for chemical physics of solids, Dresden, Germany.

-"Quantum renormalization group study of XYZ model in a transverse field",

July 23, 2003. Dept. of Physics, Uni. of Wuppertal, Wuppertal, Germany.

- "Charge and magnetization plateaux in strongly correlated models",

May 28-30, 2003. Institute for studies in theoretical Physics and Mathematics, Tehran, Iran.

- "Coherent motion and XY-model in cold glasses",

September 12, 2002. Max-Planck institute for chemical physics of solids, Dresden, Germany.

- "Finite temperature XY-model and coherent motion in cold glasses",

June 27, 2002. Dept. of Physics, Uni. of Wuppertal, Wuppertal, Germany.

- "Coherent motion in the interaction model of cold glasses",

September 13, 2001. Max-Planck Institute for complex systems, Dresden, Germany.

- "Magnetization Plateaux in Ferrimagnetic Ladders",

February 27, 2001, Dept. of Physics, Uni. des Saarlandes, Saarbrucken, Germany.

- "Low Energy Properties of 2-Leg Ferrimagnetic Ladders",

June 15, 2000, Dept. of Physics, Uni. of Wuppertal, Wuppertal, Germany.

- "Ferrimagnetic Ladders",

March 16, 2000, Max-Planck Institute for complex systems, Dresden, Germany.