J. P Kotzé

A biological and chemical study of several anaerobic digesters

D. F. Toerien, P. G. Thiel, J. Kotzé, 1968 .

Anaerobic digestion II. The characterization and control of anaerobic digestion

P. G. Thiel, J. Kotzé, J. P Kotzé, 1969 .

Biological changes during the adaptation of an anaerobic digester to a synthetic substrate

D. F. Toerien, P. G. Thiel, J. Kotzé, 1967 .