1. Tumors and tumor-like lesions in the genitalia of sows;Akkermans;Vet. Q.,1984
2. Evaluating porcine reproductive failure by the use of slaughterchecks;Almond;Comp. Contin. Educ.,1992
3. Baier, E.I., 1984. Slaughtering reasons and pathological–anatomical diagnosis of sows in the district of the slaughter house of Bad-Buchau. Thesis, 97 pp.
4. Sexual maturation and morphological development of the reproductive tract in large white and prolific Chinese Meishan pigs;Bazer;J. Reprod. Fert.,1988
5. Untersuchungen uber Möglichkeiten einer Pubertätsvorverlagerung mit Hilfe der Brunst-bzw. Ovulationssynchronisation;Braune;Monatshefte fur Veterinärmedizin,1975