References
- Claassen, T. H. L., Hoogterp, D. & Jacobi, F., 1983: Water quality and acidification in Friesland. — Dept. of Public Works in Friesland (in Dutch).
- Jonasson, P. M., 1969: Bottom fauna and eutrophication. — Eutrophication: courses, consequences, corrections: 274–305.
- Maarleveld, G. E. & Toorn, J. C. van den, 1955: Pingo-remnants in the northern Netherlands. — K. N. A. G. 72: 344–360 (in Dutch, summary in English).
- Mauch, E., 1976: Leitformen der Saprobität für die biologische Gewässeranalyse. — Cour. Forsch. Inst. Senkenberg 21.
- Ministry for Transport and Public Works, 1981: Water action programme: 1980–1984. — The Hague.
- Moller Pillot, H. K. M. & Krebs, B., 1981: Review of the ecology of Chironomid-larvae in the Netherlands (in Dutch).
- Ploeg, D. T. E. van der, 1960: Flora and vegetation of eastern Friesland. — Wetensch. Meded. K. N. N. V. 36 (in Dutch, summary in English).
- Schroevers, P. J., 1962: Eutrophication in a moorland pool: the Mekelermeer, Drenthe. — D. L. N. 65: 221–228 (in Dutch).
- Tansley, A. G. & Chipp, C. G., 1926: Aims and methods in the study of vegetation. — London.
- Voo, E. E. van der, 1962: Geomorphology and vegetation of pools near Ureterp, Friesland. — D. L. N. 65: 12–19 (in Dutch).