1974 ◽  
Vol 133 (1) ◽  
pp. 30-50 ◽  
Author(s):  
N. H. Andersen
Keyword(s):  

1997 ◽  
Vol 42 (2) ◽  
pp. 170-170
Author(s):  
Dan Vinson
Keyword(s):  

1988 ◽  
Vol 33 (4) ◽  
pp. 374-375
Author(s):  
No authorship indicated

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