TY  - RPRT
TI  - Variations in semen parameters from fathers.
AU  - T G Cooper
AU  - F Jockenhövel
AU  - E Nieschlag
PY  - 1991
DO  - 10.1093/oxfordjournals.humrep.a137441
UR  - https://pubmed.ncbi.nlm.nih.gov/1757526/
ID  - 1757526
ER  -