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Cambrosio Mann, Mireille; Friess, Armin E; Stoffel, Michael Hubert (2003). Blood-tissue barriers in the male reproductive tract of the dog: a morphological study using lanthanum nitrate as an electron-opaque tracer. Cells tissues organs, 174(4), pp. 162-169. Karger 10.1159/000072719
Stoffel, Michael Hubert; Busato, André; Friess, Armin E (2002). Density and distribution of anionic sites on boar ejaculated and epididymal spermatozoa. Histochemistry and cell biology, 117(5), pp. 441-445. Springer 10.1007/s00418-002-0401-7
Stoffel, Michael Hubert; Friess, Armin E (2002). Demonstration and cytochemical analysis of anionic sites on ejaculated boar spermatozoa: a scanning electron microscopy study using cationised colloidal gold. Histochemistry and cell biology, 117(1), pp. 61-67. Springer 10.1007/s00418-001-0350-6
