Abstract

References
1.
Bassett
D C J
Stokes
K J
Thomas
W R G
(1970 ) Lancet
i , 1188 .
2.
Blake
G C
(1963 ) British Dental Journal
115 , 413 .
3.
Jepson
J D
(1968 ) Journal of the Society for Water Treatment and Examination
17 , 205 .
4.
McEntegart
M G
Clark
A
(1973 ) British Dental Journal
134 , 140 .
5.
Miles
A A
Misra
S S
Irwin
J O
(1938 ) Journal of Hygiene (London)
38 , 732 .
6.
Schiff
J
Suter
L S
Gourley
R D
Sutliff
W D
(1961 ) Annals of Internal Medicine
55 , 499 .
7.
Sorrell
W B
White
L V
(1953 ) American Journal of Clinical Pathology
23 , 134 .
8.
Speller
D C E
Stephens
M E
Viant
A C
(1971 ) Lancet
i , 798 .
