Jan van Aken Entwicklung und Erprobung von Fixierungsverfahren für Experimente an Pflanzen unter Mikrogravitation Diss. (PhD) Universität Hamburg, 1993. (Biology) http://www.worldcat.org/oclc/894959991
Susana Pimiento Chamorro Addressing environmental modification in post-Cold War conflict : the convention on the prohibition of military or any other hostile use of environmental modification techniques (ENMOD) and related agreements. 2001. http://www.worldcat.org/oclc/822685964