Geodesic
The problem of generalized Green matrices
Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 113-120 
V. M. Zubov. The problem of generalized Green matrices. Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 113-120. http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a11/
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     author = {V. M. Zubov},
     title = {The problem of generalized {Green} matrices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {113--120},
     year = {1974},
     volume = {15},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a11/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Azbelev's $W$-method is used for the construction of the theory of the generalized Green matrices. In this way one finds a class of matrices which preserve the form of the solution of the boundary value problem with a well-defined right-hand side in the case when this problem is uniquely solvable.