TY  - RPRT
TI  - Individual differences in human circadian rhythms.
AU  - J A Horne
AU  - O Ostberg
PY  - 1977
DO  - 10.1016/0301-0511(77)90001-1
UR  - https://pubmed.ncbi.nlm.nih.gov/922076/
ID  - 922076
ER  -