by Hansen K.K
Published in Hyologisk Tidsskrift. Svinet (1988)

by Ehreth, J T, Miller, J I, McBeath, R B, Hansen, K K, Ahmann, F R, Dalkin, B L, Schiff, Jr, M
Published in British journal of urology (01.01.1995)

by Dall J, Hansen K.K, Ripley P.H
Published in Anaporc (2000)

by Friis, N.F, Hansen, K.K, Schirmer, A.L, Aabo, S. (Statens Veterinaere Serumlaboratorium, Copenhagen (Denmark))
Published in Acta Veterinaria Scandinavica (Denmark) (1992)