Valdivia Villar, R. S.; Burger O., L.: Descripción de Daphniopsis marcahuasensis sp. nov. (Cladocera: Daphniidae) del Perú, con la inclusión de una clave de identificación de las especies del Género. Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas 10 (4), pp. 439 - 452 (1989)

Lampert, W.: The adaptive significance of diel vertical migrations. Functional Ecology 3 (1), pp. 21 - 27 (1989)

Sütfeld, R.: Preparative liquid chromatography with analytical separation quality: Internal injection/displacement reversed-phase high-performance liquid chromatography. Journal of Chromatography A 464, pp. 103 - 115 (1989)

Wanlian, L.; Overbeck, J.: Methodology for studies of carbon dynamics between phytoplankton primary production and heterotrophic bacterial sedondary production. Chin. J. Oceanol. Limnol. 7 (1), pp. 17 - 32 (1989)

Thienemann, A. F.: Leben und Umwelt. Vom Gesamthaushalt der Natur. Arbeitsgemeinschaft Freiraum und Vegetation, Kassel (1989), 153 pp.

Lampert, W.; Fleckner, W.; Pott, E.; Schober, U.; Störkel, K.-U.: Herbicide effects on planktonic systems of different complexity. International Conference on Environmental Bioassay Techniques and their Application, Lancaster, England, July 11, 1988 - July 14, 1988. Hydrobiologia 188/189, pp. 415 - 424 (1989)