1. Andersen, N. Miller; Seasonal polymorphism and developmental changes in organs of flight and reproduction in bivoltine pondskaters (Hem. Gerridae). Entomol. Scand. 4, 1–20 (1973).
2. Andersen, N. Miller: The Lvmogorvus and Neogerris of the Old World with character analysis and a reclassification of the Gerrinae (Hemiptera: Gerridae). Entomol. Scand., Suppl. 7, 1–96 (1975).
3. Boer, P. J. den: Spreading the risk and stabilization of animal numbers. Acta Biotheor. 18, 165–194 (1968).
4. Bradshaw, W. E.: Homeostasis and polymorphism in vernal development of Chaobovus amevieanus. Ecology 54, 1247–1259 (1973).
5. Cohen, D.: Optimizing reproduction in a randomly varying environment. J. Theor. Biol. 12, 119–129 (1966).