1. Pouch formations by invaginations of the nuclear envelope of bovine and porcine sperm as a sign of disturbed spermatogenesis;BANE;Nordisk Veterinaermedicin,1965
2. BARTH, A. D. OKO, R. J. 1989, Abnormal morphology of bovine spermatozoa, Ames, Iowa State University Press
3. Pathological conditions in the genital organs and in the semen as grounds for rejection of breeding bulls for import or export to or from Denmark, 1958–1982;BLOM;Nordisk Veterinaermedicin,1983
4. Effect of dexamethasone on the incidence of the “crater” defect of bovine sperm;COULTER;Theriogenology,1976
5. Incidence and ultrastructure of the “crater” defect of bovine spermatozoa;COULTER;Theriogenology,1978