TY  - RPRT
TI  - Human sperm head ultrastructure: a freeze-etching study.
AU  - J K Koehler
PY  - 1972
DO  - 10.1016/s0022-5320(72)90118-9
UR  - https://pubmed.ncbi.nlm.nih.gov/4556325/
ID  - 4556325
ER  -