M?nster U., De Haan H.The role of microbial extracellular enzymes in the transformation of dissolved organic matter in humic waters // Aquatic humus substances / D.O Hessen, L.J. Tranvik (Eds.) Springer-Verlag, Berlin Heidelberg, 1998, p. 199 - 257.
M?nster U.Consentrations and fluxes of organic carbon substrates in the aquatic environment // Antonie Leeuwenhoek, 1993, v.63, p. 243 - 274.