O'Connor JT.
N Y State Dent J. 1976 Feb;42(2):107.
PMID: 1060993

[No authors listed]
J Am Dent Assoc. 1979 Jun;98(6):963-98. doi: 10.14219/jada.archive.1979.0208.
PMID: 287716

O'Connor JT.
J Am Dent Assoc. 1977 Jun;94(6):1056-7. doi: 10.14219/jada.archive.1977.0371.
PMID: 266514

Graham JW.
J Am Dent Assoc. 1977 Jun;94(6):1202-5.
PMID: 266535

Gardner AF.
J Calif Dent Assoc. 1977 Jun;5(6):8-9.
PMID: 267067

Deleuran P.
Tidsskr Prakt Tandlaeg. 1979 Feb;9(1):10-12.
PMID: 284639

Roistacher SL.
J Dent Educ. 1976 Apr;40(4):202.
PMID: 1063157