Agriculture and Environment, Volume 3, Issue 1, December 1976, Pages 45-56
Application of vegetation science to grassland husbandry / ed. by W. Krause, 1977
Internet, http://www.biologie.uni-rostock.de/oekologie/literature/RMB/Heft%2013/RMB-13-Checkliste-09-26.pdf,
2011-05-17
LCNA 1977-1986