scholarly journals An initial value problem for a class of equations of mixed type

1949 ◽  
Vol 55 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Stefan Bergman
1997 ◽  
Vol 124 (2) ◽  
pp. 133-145
Author(s):  
J. S. Cassell ◽  
Zhanyuan Hou

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