Pellinen A, Widström E.
Suom Hammaslaakarilehti. 1990 Jun 15;37(12):697-700.
PMID: 2244108

Hoad-Reddick G.
Probe (Lond). 1989 Jul;31(7):10-1.
PMID: 2631097

Gerbert B.
J Dent Educ. 1986 Oct;50(10):585-93.
PMID: 3463597

Schwartz B.
Dent Manage. 1987 Oct;27(10):48-50, 52, 54-6 passim.
PMID: 3478251

Selden EB.
Dent Stud. 1968 Dec;47(3):184-5.
PMID: 5250677

Buhler JE.
S C Dent J. 1968 Dec;26(12):24-6.
PMID: 5248675

Jacques O.
Dent Stud. 1974 May;52(8):60-3.
PMID: 4523886