TY  - RPRT
TI  - Reference charts for controlled extraoral force application to maxillary molars.
AU  - R A Greenspan
PY  - 1970
DO  - 10.1016/0002-9416(70)90025-4
UR  - https://pubmed.ncbi.nlm.nih.gov/5273636/
ID  - 5273636
ER  -