Conferences
Title Locale
Workshop on Semigroups 2012 (to remember John M. Howie on the occasion of his 76th birthday)  Instituto para a Investigação Interdisciplinar da Universidade de Lisboa, Lisboa, Portugal, 23-25/05/2012 (Organizing Committee)
The second international congress in algebras and combinatorics, dedicated to the 70 birthday of Leonid A. Bokut  Beijing, China, 6-11/07/2007 and Xi'an, China, 12-15/07/2007 
Fountainfest "Semigroups, categories and automata", a conference celebrating John Fountain's 65th birthday and his mathematical achievements  University of York, UK, 12-14/10/2006 (Invited Speaker)
Algebra and Discrete Mathematics - Symmetries and Ordered Structures under the Influence of Model Theory and Combinatorics  Hattingen (near Essen), Germany, 26-31/07/2003 (Invited Speaker)
Structural Theory of Automata, Semigroups and Universal Algebra  University of Montreal, Canada, 07-18/07/2003 
International Meeting on Semigroup Theory and Related Topics  University of Minho, Braga, Portugal, 25-28/06/2003 (Invited Speaker)
International Workshop on Semigroups and Languages  CAUL, Lisbon, Portugal, 27-29/11/2002 (Organizing Committee)
 
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