@article{DE_1979_15_2_a22,
     author = {Z. M. Narkun},
     title = {Addition theorems for ``outer'' harmonic functions in elliptic coordinates},
     journal = {Differencialʹnye uravneni\^a},
     pages = {357--359},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_2_a22/}
}