TY  - RPRT
TI  - Annual biological clocks.
AU  - E T Pengelley
AU  - S J Asmundson
PY  - 1971
DO  - 10.1038/scientificamerican0471-72
UR  - https://pubmed.ncbi.nlm.nih.gov/5545632/
ID  - 5545632
ER  -