Geodesic
Harmonic functions with a given set of singularities
Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 1, pp. 75-76 
N. S. Nadirashvili. Harmonic functions with a given set of singularities. Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 1, pp. 75-76. http://geodesic.mathdoc.fr/item/FAA_1988_22_1_a13/
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     title = {Harmonic functions with a given set of singularities},
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     year = {1988},
     volume = {22},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1988_22_1_a13/}
}
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[1] Sobolev S.L., Uravneniya matematicheskoi fiziki, Gostekhizdat, M., 1954 | MR

[2] Morse M., Cairns S.S., Critical point theory in global analysis and differential topology, Academic press, N.Y.-London, 1969 | MR | Zbl