Geodesic
Fundamental solutions of linear elliptic equations containing a small parameter
Matematičeskie zametki, Tome 4 (1968) no. 4, pp. 425-434.

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The author considers a linear elliptic equation with constant coefficients and a small parameter in the leading terms. The method of plane waves is used to construct a family of fundamental solutions for this equation, for which a theorem on its asymptotic expansion is proved. 
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     author = {N. A. Ivanova},
     title = {Fundamental solutions of linear elliptic equations containing a small parameter},
     journal = {Matemati\v{c}eskie zametki},
     pages = {425--434},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_4_a5/}
}
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N. A. Ivanova. Fundamental solutions of linear elliptic equations containing a small parameter. Matematičeskie zametki, Tome 4 (1968) no. 4, pp. 425-434. http://geodesic.mathdoc.fr/item/MZM_1968_4_4_a5/