Geodesic
The solution of some perturbation problems for matrices and selfadjoint or non-selfadjoint differential equations.~I
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 3, pp. 1-73

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     author = {M. I. Vishik and L. A. Lyusternik},
     title = {The solution of some perturbation problems for matrices and selfadjoint or non-selfadjoint differential {equations.~I}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--73},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1960},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_3_a0/}
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M. I. Vishik; L. A. Lyusternik. The solution of some perturbation problems for matrices and selfadjoint or non-selfadjoint differential equations.~I. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 3, pp. 1-73. http://geodesic.mathdoc.fr/item/RM_1960_15_3_a0/