1990 ◽  
Vol 41 (910) ◽  
pp. 2265-2272 ◽  
Author(s):  
N. S. Murthy ◽  
H. Minor ◽  
M. K. Akkapeddi ◽  
B. Van Buskirk

1981 ◽  
Vol 21 (15) ◽  
pp. 985-996 ◽  
Author(s):  
J. W. Barlow ◽  
D. R. Paul

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