Geodesic
Theory of singular perturbations with a~non-smooth spectrum of the~limit operator
Sbornik. Mathematics, Tome 186 (1995) no. 7, pp. 951-966

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This work is devoted to the development of the regularization method [1] for the case where the spectrum of the limit variable operator has non-smooth singularities. The case will be investigated where one of the eigenvalues of the limit operator $A(t)$ vanishes identically on certain sections of the segment [0, T], and the approach to these sections has a polynomial singularity. Such problems arise in the radio and impulse technologies. 
@article{SM_1995_186_7_a2,
     author = {A. G. Eliseev},
     title = {Theory of singular perturbations with a~non-smooth spectrum of the~limit operator},
     journal = {Sbornik. Mathematics},
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     volume = {186},
     number = {7},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_7_a2/}
}
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A. G. Eliseev. Theory of singular perturbations with a~non-smooth spectrum of the~limit operator. Sbornik. Mathematics, Tome 186 (1995) no. 7, pp. 951-966. http://geodesic.mathdoc.fr/item/SM_1995_186_7_a2/