Geodesic
Singularly perturbed problems with double singularity
Matematičeskie zametki, Tome 62 (1997) no. 4, pp. 494-501

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A class of singularly perturbed initial and boundary value problems for systems of linear differential equations with singularities of various types is studied. The asymptotics of the solutions of these problems is constructed; in contrast to known results, it involves boundary layers of new types that are dependent not only on the spectrum of the limit operator. 
@article{MZM_1997_62_4_a1,
     author = {Yu. A. Konyaev},
     title = {Singularly perturbed problems with double singularity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {494--501},
     publisher = {mathdoc},
     volume = {62},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_4_a1/}
}
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Yu. A. Konyaev. Singularly perturbed problems with double singularity. Matematičeskie zametki, Tome 62 (1997) no. 4, pp. 494-501. http://geodesic.mathdoc.fr/item/MZM_1997_62_4_a1/