TY  - RPRT
TI  - Four root canals in a mandibular second premolar.
AU  - M Wong
PY  - 1991
DO  - 10.1016/s0099-2399(06)81744-9
UR  - https://pubmed.ncbi.nlm.nih.gov/1940727/
ID  - 1940727
ER  -