06.2009:
certificado de participation (recycling congress Zaragoza)05.2009:
Introduction speech Michael Stoll - recycling conference Zaragoza05.2009:
Speech Michael Stoll - recycling conference Zaragoza05.2009:
Agenda of the recycling conference in Zaragoza09.2007:
Introduction speech Michael Stoll - recycling conference Amsterdam09.2007:
Program of the recycling conference 2007 Amsterdam