Abstract

References
1.
Haig
D A
McDiarmid
A
(1963 ) Nature, London
200 , 381 –382
2.
Keymer
I F
(1972 ) Veterinary Record
91 , 373 –381
3.
Kôzusnik
Z
(1960 ) Sbornik Ceskoslovênskê Akademie Zemedelskych Vêd Veterinárnie Medicina
5 , 789 –798
4.
Rasmussen
R K
(1938 ) Ugeskrift for Læger
100 , 989 –998
5.
Rubin
H
Kessling
R
Chamberlain
R W
Edison
M E
(1951 ) Proceedings of the Society for Experimental Biology and Medicine
78 , 696 –698
