Cassingham RJ.
LDA J. 1987;46(1):35.
PMID: 3472022

Waldman HB.
J Ala Dent Assoc. 1994;78(1):34-42.
PMID: 8040521

Blashka R.
J Am Dent Assoc. 2003 Nov;134(11):1432; discussion 1432, 1434. doi: 10.14219/jada.archive.2003.0060.
PMID: 14664256

[No authors listed]
J Am Dent Assoc. 1959 May;58(5):88-90.
PMID: 13653909

Littleton PA.
J Dent Educ. 1980 May;44(5):241-5.
PMID: 6928876

Litvag I.
J Mo Dent Assoc. 1975 Jun-Jul;55(6):40-3.
PMID: 1061835

Bailit HL, Beazoglou T.
J Dent Educ. 2017 Aug;81(8):eS1-eS12. doi: 10.21815/JDE.017.001.
PMID: 28765449