1. Affolter H (1980) Studies on the kinetics and charge stoichiometry of Ca-(2+)-transporting systems using ion-selective electrodes. Thesis, Swiss Federal Institute of Technology, Z�rich
2. Affolter H, Sigel E (1979) A simple system for the measurement of ion activities with solvent polymeric membrane electrodes. Anal Biochem 97:315?319
3. Butsch BM (1984) Investigations on the ecology and bioenergetics of methanogenic bacteria. Thesis, University of Z�rich, Z�rich
4. Butsch BM, Bachofen R (1981) Temperature studies on methanogenic bacteria in Icelandic hot springs. Research Institute Nedri As, Hveragerdi, Iceland 36:21?42
5. Butsch BM, Bachofen R (1982) Measurement of the membrane potential ?? by use of an electrode sensitive to tetraphenyl-phosphonium (TPP+) in Methanobacterium thermoauto-trophicum. EBEC Reports 2:333?334