TY  - RPRT
TI  - Internal fertilization: adaptive value to early amniotes.
AU  - G C Packard
AU  - D L Kilgore
PY  - 1968
DO  - 10.1016/0022-5193(68)90193-8
UR  - https://pubmed.ncbi.nlm.nih.gov/5727242/
ID  - 5727242
ER  -