Les diatomées de la station néolithique d'Auvernier (Lac de Neuchâtel) Marguerite Wuthrich OriginalPaper Pages: 533 - 552
Untersuchungen zur Abgrenzung der ArtenPhormidium uncinatum undPhormidium autumnale D. P. HäderW. Nultsch OriginalPaper Pages: 566 - 577
Effect of the substrate-concentration on the methane fermentation of sewage sludge J. MalýH. Fadrus OriginalPaper Pages: 578 - 591
Effect of pH on the filtration of aquatic humus using gels and membranes E. T. Gjessing OriginalPaper Pages: 592 - 600