Seasonal dynamics, composition and feeding patterns of ciliate assemblages in oligotrophic lakes covering a wide pH range. Archiv für Hydrobiologie 166: 261-287.
. 2006. Are bacteria the major producers of extracellular glycolytic enzymes in aquatic environments?. International Review of Hydrobiology 89: 102–117.
. 2004. Investigations on pelagic food webs in mountain lake - aims and methods. Journal of Limnology 58: 77-87.
. 1999.