Abstract
References
1.
Gynning
I.
(1951 ) Acta radiol., Stockh. , 35 , 428 .
2.
Krebs
C.
Nielson
H.
Andersen
P. E.
(1949 ) Acta radiol., Stockh. , 32 , 304 .
3.
Spiers
F. W.
(1951 ) Brit. J. Radiol. , 24 , 365 .