TY  - RPRT
TI  - Persistent visual changes following hashish consumption.
AU  - G L Laffi
AU  - A B Safran
PY  - 1993
DO  - 10.1136/bjo.77.9.601
UR  - https://pubmed.ncbi.nlm.nih.gov/8218063/
ID  - 8218063
ER  -