T. A. Bakke, P. A. Jansen, and Åge Brabrand, “Susceptibility and resistance of brook lamprey, Lampetra planeri (Bloch), roach, Rutilus rutilus (L.) and perch, Perca fluviatilis L. to Gyrodactylus salaris Malmberg (Monogenea)”, Fauna Norv., vol. 11, pp. 23-26, Dec. 1990.