1. Ergens, R. (1965a) Die Morphogenese der chitinoiden Teile des Haptors bei Gyrodactylus decorus Malmberg, 1956 (Monogenoidea) und iher morphologischmetrische Variabilit�t. Zeitschrift f�r Parasitenkunde, 25, 359?370.
2. Ergens, R. (1965b) Die Morphologenese der chitinoiden Teile des Haptors bei Gyrodactylus tincae (Malmberg, 1956) Malmberg, 1964 (Monogenoidea) und ihre morphologischmetrische Variabilit�t. Zeitschrift f�r Parasitenkunde, 26, 173?184.
3. Ergens, R. & Gelnar, M. (1985) Experimental verification of the effect of temperature on the size of hard parts of opisthaptor of Gyrodactylus katharineri Malmberg, 1964 (Monogenea). Folia Parasitologica, 32, 377?380.
4. Heggberget, T.G. & Johnsen, B.O. (1982) Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers. Journal of Fish Biology, 21, 15?26.
5. Johnsen, B.O. (1978) The effect of an attack by the parasite Gyrodactylus salaris on the population of salmon parr in the river Lakselva, Misv�r in Northern Norway. Astarte, 11, 7?9.