TY  - RPRT
TI  - Cephalometric soft tissue facial analysis.
AU  - R T Bergman
PY  - 1999
DO  - 10.1016/s0889-5406(99)70222-2
UR  - https://pubmed.ncbi.nlm.nih.gov/10511665/
ID  - 10511665
ER  -