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 
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/
@article{DAN_1960_131_5_a4,
     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},
     year = {1960},
     volume = {131},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_5_a4/}
}
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