Geodesic
The method of perturbations for singular problems
Izvestiya. Mathematics , Tome 6 (1972) no. 3, pp. 631-648

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In this paper the regularization of a singularity with respect to a parameter is derived by means of an extension of the original operator and subsequent application of perturbation theory in an unbounded space, and used to solve an “extended” problem asymptotically. It is proved that this asymptotic solution is unique. An appropriate restriction of the asymptotic solution thus obtained will be an asymptotic solution of the original problem; this restriction is also unique. The theory of this method is illustrated by an example of an ordinary linear system of general form. 
@article{IM2_1972_6_3_a10,
     author = {S. A. Lomov},
     title = {The method of perturbations for singular problems},
     journal = {Izvestiya. Mathematics },
     pages = {631--648},
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     number = {3},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1972_6_3_a10/}
}
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S. A. Lomov. The method of perturbations for singular problems. Izvestiya. Mathematics , Tome 6 (1972) no. 3, pp. 631-648. http://geodesic.mathdoc.fr/item/IM2_1972_6_3_a10/