TY  - RPRT
TI  - Pain in endodontic therapy: preliminary study.
AU  - E M O'Keefe
PY  - 1976
DO  - 10.1016/s0099-2399(76)80047-7
UR  - https://pubmed.ncbi.nlm.nih.gov/1068208/
ID  - 1068208
ER  -