Microbial food webs in an artificially divided acidic bog lake. International Review of Hydrobiology 83: 3–18.
. 1998. . 2006.
Impact of ionic aluminium on extracellular phosphatases in acidified lakes. Environmental Microbiology 3: 578-587.
. 2001. Conspicuous peak of oligotrichous ciliates following winter stratification in a bog lake. Journal of Plankton Research 23: 353-363.
. 2001. Are bacteria the major producers of extracellular glycolytic enzymes in aquatic environments?. International Review of Hydrobiology 89: 102–117.
. 2004.