1998 ◽  
Vol 47 (1) ◽  
pp. 2-3
Author(s):  
Michael Schäfer ◽  
Christoph Stein

1940 ◽  
Vol 19 (15) ◽  
pp. 345-347 ◽  
Author(s):  
W. Thiele ◽  
P. Guzinski

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