1949 ◽  
Vol 42 (6) ◽  
pp. 517-525 ◽  
Author(s):  
Irving E. Alexander ◽  
Fredrick J. Githler
Keyword(s):  

Author(s):  
A L Iakovenko ◽  
A Y Dunin ◽  
P V Dushkin ◽  
E A Savastenko ◽  
M G Shatrov

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