TY  - RPRT
TI  - Is it really free?
AU  - R C Morell
AU  - A S Foreman
AU  - R L Royster
PY  - 1993
DO  - 10.1097/00000542-199304000-00038
UR  - https://pubmed.ncbi.nlm.nih.gov/8466085/
ID  - 8466085
ER  -