TY  - RPRT
TI  - Psychological differences between long and short sleepers.
AU  - E Hartmann
AU  - F Baekeland
AU  - G R Zwilling
PY  - 1972
DO  - 10.1001/archpsyc.1972.01750230073014
UR  - https://pubmed.ncbi.nlm.nih.gov/5019885/
ID  - 5019885
ER  -