TY  - RPRT
TI  - Tolerance development to butorphanol: comparison with morphine.
AU  - Y Z Feng
AU  - Y T Tseng
AU  - S P Jaw
AU  - B Hoskins
AU  - I K Ho
PY  - 1994
DO  - 10.1016/0091-3057(94)90083-3
UR  - https://pubmed.ncbi.nlm.nih.gov/7862720/
ID  - 7862720
ER  -