Geodesic
The method of variation of parameters as applied to the computation of eigenvalues and eigenvectors of matrices
Doklady Akademii Nauk, Tome 131 (1960) no. 5, pp. 1007-1010.

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     author = {D. F. Davidenko},
     title = {The method of variation of parameters as applied to the computation of eigenvalues and eigenvectors of matrices},
     journal = {Doklady Akademii Nauk},
     pages = {1007--1010},
     publisher = {mathdoc},
     volume = {131},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_5_a4/}
}
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D. F. Davidenko. The method of variation of parameters as applied to the computation of eigenvalues and eigenvectors of matrices. Doklady Akademii Nauk, Tome 131 (1960) no. 5, pp. 1007-1010. http://geodesic.mathdoc.fr/item/DAN_1960_131_5_a4/