Hypoellipticity of Certain Differential Operators with Degeneration of Infinite Order

Author(s):  
M. Reissig ◽  
K. Yagdjian
1977 ◽  
Vol 21 (1) ◽  
pp. 19-21 ◽  
Author(s):  
N. I. Nagnibida ◽  
N. P. Oliinyk

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