Swiss lake and mire environments during the last 15000 years [presented at the joint meeting of the Eurosiberian Holocene Subcommission of the INQA and the Internat. Geolog. Correlation Programme (IGCP) 158 in summer 1985 in Bern, Switzerland] - Lang, Gerhard 1924-2016 (Dissertationes botanicae, 1985)