TY  - RPRT
TI  - Mandibular first molars with six root canals.
AU  - A Martinez-Berna
AU  - P Badanelli
PY  - 1985
DO  - 10.1016/s0099-2399(85)80043-1
UR  - https://pubmed.ncbi.nlm.nih.gov/3863876/
ID  - 3863876
ER  -