Abstract

References
1.
Ansell
G
(1970a ) Investigative Radiology
5 , 374
2.
Ansell
G
(1970b ) British Journal of Radiology
43 , 395
3.
Fischer
H W
Doust
V L
(1972 ) Radiology
193 , 497
4.
Pendergrass
H P
Tondreau
R S
Pendergrass
E P
Ritchie
D J
Hildreth
E A
Askovitz
S I
(1958 ) Radiology
71 , 1
5.
Saxton
H M
(1969 ) British Journal of Radiology
42 , 321
6.
Witten
D M
Hirsch
F D
Hartman
G W
(1973 ) American Journal of Roentgenology
119 , 832
