· November 2011: Laboratoire d'Informatique Fondamentale de Marseille, Marseille, France.
· October 2011: Slovak Academy of Sciences, Bratislava, Slovakia.
· November 2010: Laboratoire d'Informatique Fondamentale de Marseille, Marseille, France.
· August 2010: McMaster University, Hamilton, Canada.
· August 2010: Carleton University, Ottawa, Canada.
· March 2010: McMaster University, Hamilton, Canada.
· February 2010: Carleton University, Ottawa, Canada.
· February 2009: Comenius University, Bratislava, Slovakia.
· February 2006: Carleton University, Ottawa, Canada.
· April - May 2005: Carleton University, Ottawa, Canada. (talk abstract)
· November 2004: Project MASCOTTE, INRIA, Sophia – Antipolis, France.