Visits to other institutions:

Swedish Space Corpration, Stockholm and Uppsala University, Uppsala, Sweden, 1998, 2 weeks.

Centre d'Etudes Spatiales de la Biosph(re (CESBIO), Centre National d'Etudes Spatiales (CNES), Toulouse, France,1998, 1 week.

Uppsala University, Uppsala, Sweden, 1996, 2 weeks.

Centre d'Ecologie Fonctionelle et Evolutive - CNRS, Montpellier, France, 1995, 2 weeks.

Swedish University of Agricultural Sciences, 1995, 1 month.

Centre d'Ecologie Fonctionelle et Evolutive - CNRS, Montpellier, France,1994, 3 weeks.

Swedish University of Agricultural Sciences, 1993, 2 weeks.

University of Wisconsin, Madison, USA, 1991, 3 weeks.