2008

• Kremer, Gilberto, Physics Department, University of Paraná, Brasil
  January 14 -February 8 (Soares Ana Jacinta).

2007

• Kremer, Gilberto, Physics Department, University of Paraná, Brasil
  January 11 -February 11 (Soares Ana Jacinta).
• Paul Tod, Mathematical Institute, University of Oxford, U.K.
  17/March - 1/April e 23-27/September (Filipe C. Mena)
• José Natário, Dep. Matemática, Instituto Superior Técnico, Lisboa. 24-25/September (Filipe C. Mena)

2006

• Kremer, Gilberto, Physics Department, University of Paraná, Brazil
  January 11 -February 11 (Soares Ana Jacinta).
• Pandolfi Bianchi, Miriam, Department of Mathematics, Politecnico di Torino, Italy
  February 2-5 (Soares Ana Jacinta).