TY  - RPRT
TI  - Comparison between guided and freehand preparation.
AU  - L Mollersten
PY  - 1989
DO  - 10.1016/0022-3913(89)90298-9
UR  - https://pubmed.ncbi.nlm.nih.gov/2668506/
ID  - 2668506
ER  -