1. N. Haring, N. Den Daas, and H. Woelders (1994 ). Europ. AI Veterinarians Sixth Meeting, Peebles, Scotland, Proceedings.
2. H. Paulenz, IS. Grevle, A.A. Tverdal, P.O. Hofmo, and K. Andersen Berg (1995 ). (subm. for publication).
3. P.W. Strike (1991 ). Statistical methods in laboratory medicine . Butterworth-Heinemann Ltd., Oxford, pp.254 -330 .
4. K.F. Weitze, and E. Muller (1991 ). Gustav Fischer Verlag, Jena & Stuttgart, pp.269 -310 .
5. H. Woelders (1990 ). Second Intern. Conf. on Boar Semen Preservation, Beltsville, USA, Proceedings, pp.145 -164 .