https://digital.katalog.queersearch.org/s/katalog/item/44062, “Fertilitätsstörungen des Mannes: Diagnostik, Biochemie des Spermaplasmas, Homontherapie”, https://digital.katalog.queersearch.org/s/katalog/item/48574, QueerSearch, accessed 30. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/27303