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3. Einfuhrung der kuunstlicheen Besamung in der Maultierzucht Marokkos;Beck;Tierarztl Umsch,1982
4. Characteristics of the semen of stallions. Macro and microscopic investigations with estimation of fertility;Bielanski;Anim Breed Abstr,1951
5. Some properties of the output of semen of jacks;Bielanski;Acta Biol Cracov Ser Zool,1962