Kirchhoff C, Osterhoff C, Pera I, Schroter S (1999). „Function of human epididymal proteins in sperm maturation”. Andrologia. 30 (4–5): 225—32. PMID9739419. doi:10.1111/j.1439-0272.1998.tb01164.x.
Osterhoff C, Ivell R, Kirchhoff C (1997). „Cloning of a human epididymis-specific mRNA, HE6, encoding a novel member of the seven transmembrane-domain receptor superfamily”. DNA Cell Biol. 16 (4): 379—89. PMID9150425. doi:10.1089/dna.1997.16.379.
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Kirchhoff C, Osterhoff C, Pera I, Schroter S (1999). „Function of human epididymal proteins in sperm maturation”. Andrologia. 30 (4–5): 225—32. PMID9739419. doi:10.1111/j.1439-0272.1998.tb01164.x.
Osterhoff C, Ivell R, Kirchhoff C (1997). „Cloning of a human epididymis-specific mRNA, HE6, encoding a novel member of the seven transmembrane-domain receptor superfamily”. DNA Cell Biol. 16 (4): 379—89. PMID9150425. doi:10.1089/dna.1997.16.379.