Abstract
References
1.
Browne
L
. (1883 ) Brit. med. J.
ii , 811
2.
Brubaker
U D
Holinger
P H
. (1947 ) J. biol. photogr. Ass.
15 , 171
3.
Cardew
P N
. (1965 ) Med. biol. Ill.
15 , No. 2 , suppl. (in press)
4.
Moore
P
von Leden
H
. (1959 ) J. Amer. med. Ass.
169 , 1976
5.
Trethowan
J D
. (1956 ) J. photogr. Sci.
4 , 145