A concept of adjointness and symmetry of differential expressions based on the generalised Lagrange identity and Green's formula

Author(s):  
W. N. Everitt ◽  
F. Neuman
2018 ◽  
Vol 468 (1) ◽  
pp. 473-479 ◽  
Author(s):  
Niyaz Tokmagambetov ◽  
Berikbol T. Torebek

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