TY  - RPRT
TI  - Factor analysis of a sleep evaluation questionnaire.
AU  - A C Parrott
AU  - I Hindmarch
PY  - 1978
DO  - 10.1017/s0033291700014379
UR  - https://pubmed.ncbi.nlm.nih.gov/26096/
ID  - 26096
ER  -