TY  - RPRT
TI  - Australopithecus, Homo erectus and the single species hypothesis.
AU  - R E Leakey
AU  - A C Walker
PY  - 1976
DO  - 10.1038/261572a0
UR  - https://pubmed.ncbi.nlm.nih.gov/778631/
ID  - 778631
ER  -