1. Aleksandrova, L.N., Organicheskoe veshchestvo pochvy i protsessy ego transformatsii (Soil Organic Matter and Its Transformation Processes), Leningrad: Nauka, 1980.
2. Orlov, D.S., Gumusovye kisloty pochv i obshchaya teoriya gumifikatsii (Soil Humic Acids and the General Theory of Humification), Moscow: Mosk. Gos. Univ., 1990.
3. Logan, B.E. and Wilkinson, D.B., Fractal Geometry of Marine Snow and Other Biological Aggregates, Limnol. Oceanogr., 1990, vol. 35, no. 1, p. 130.
4. Romankevich, E.A., Geokhimiya organicheskogo veshchestva v okeane (Geochemistry of Organic Matter in Ocean), Moscow: Nauka, 1977.
5. Timofeeva, S.S. and Beim, A.M., Regularities of Ecological Transformation of Chlorlignins in Natural Waters, Vodn. Resur., 1996, vol. 23, no. 4, p. 467 [Water Resour. (Engl. Transl.), vol. 23, no. 4, p. 435].