Mié, 04/06/2003 / Sáb, 07/06/2003

Universidad de León; GEI, Grupo de Especies Invasoras

Lun, 17/05/2004 / Vie, 21/05/2004

European Centre for River Restoration, ECRR; Croatian Waters; Croatian Ministry of Environmental Protection and Physical Planning and the State Water Directorate

Mar, 15/06/2004 / Vie, 18/06/2004

International Association of Hydrogeologists; UNESCO; University of Silesia; Commission on Groundwater Protection

Dom, 27/06/2004 / Jue, 01/07/2004

American Society of Civil Engineers

Dom, 25/04/2004 / Vie, 30/04/2004

European Geophysical Union

Mié, 05/11/2003 / Vie, 07/11/2003

Departamento de Derecho del Medio Ambiente de la Universidad Externado de Colombia

Sáb, 24/07/2004 / Mié, 28/07/2004

Soil and Water Conservation Society

Mar, 14/09/2004 / Vie, 17/09/2004

Centre de Biodiversitat

Lun, 08/03/2004 / Jue, 11/03/2004

Lun, 30/05/2005 / Jue, 02/06/2005

UNESCO;The World Conservation Union (IUCN); United Nations University (UNU)