1. Åberg, B.& W. Rodhe, 1942. Uber die Milieu Faktoren in einigen südschwedischen Seen. Symb. Bot. Uppsal. 5: 1–256.
2. American Public Health Association, 1971. Standard methods for the examination of water and wastewater. 13th edition, American Public Health Association, Washington.
3. Arvola, L. 1983. Primary production and phytoplankton in two small, polyhumic forest lakes in southern Finland. Hydrobiologia 101: 105–110.
4. Arvola, L., 1984a. Diel variation in primary production and the vertical distribution of phytoplankton in a polyhumic lake. Arch. Hydrobiol. 101: 503–519.
5. Arvola, L., 1984b. Vertical distribution of primary production and phytoplankton in two small lakes with different humus concentration in southern Finland. Holarct. Ecol. 7: 390–398.