C. H. Ratsak

Effects of protozoa on carbon mineralization in activated sludge

Sebastiaan A.L.M. Kooijman, S. Kooijman, C. H. Ratsak, 1996 .

Biomass Reduction and Mineralization Increase Due to the Ciliate Tetrahymena pyriformis Grazing on the Bacterium Pseudomonas fluorescens

Bob W. Kooi, H. W. van Verseveld, B. Kooi, 1994 .

MODELLING THE GROWTH OF AN OLIGOCHAETE ON ACTIVATED SLUDGE

Bob W. Kooi, B. Kooi, S.A.L.M. Koouman, 1993 .

Modeling the Individual Growth of Tetrahymena Sp. and its Population Consequences

Bob W. Kooi, Bas Kooijman, B. Kooi, 1995 .

Sludge Reduction by Predatory Activity of Aquatic Oligochaetes in Wastewater Treatment Plants: Science or Fiction? A Review

C. H. Ratsak, Christa H. Ratsak, Jaap Verkuijlen, 2006, Hydrobiologia.

Effects of Nais elinguis on the performance of an activated sludge plant

C. H. Ratsak, 2001, Hydrobiologia.