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Vaith, P. and Maas, D. and Feigl, D. and Hauke, G. and Lang, B. and Oepke, G. and Stierle, H. E. and Bross, K. J. and Andreesen, Reinhard and Gross, G. (1985) In-vitro und In-vivo-Studien mit Interleukin-2 und verschiedenen Immunstimulanzien bei einer Patientin mit Aids. Immunität und Infektion 13 (2), pp. 51-63.
Maas, D. and Poschlod, Peter (1991) Restoration of exploited peat areas in raised bogs – technical management and vegetation development. In: Ravera, Oscar, (ed.) Terrestrial and aquatic ecosystems: Perturbation and recovery. Ellis Horwood series in environmental management, science and technology. Horwood, New York, pp. 379-386. ISBN 0-13-928201-7.