Geodesic
On a special case of the equation $K(y)u_{xx}+u_{yy}+\dfrac{l(y)}{y}u_y=0$
Trudy seminara po kraevym zadačam, Trudy Seminara po Kraevym Zadacham, Tome 15 (1978) no. 15, pp. 86-92 
Yu. M. Krikunov. On a special case of the equation $K(y)u_{xx}+u_{yy}+\dfrac{l(y)}{y}u_y=0$. Trudy seminara po kraevym zadačam, Trudy Seminara po Kraevym Zadacham, Tome 15 (1978) no. 15, pp. 86-92. http://geodesic.mathdoc.fr/item/KUKZ_1978_15_15_a11/
@article{KUKZ_1978_15_15_a11,
     author = {Yu. M. Krikunov},
     title = {On a special case of the equation $K(y)u_{xx}+u_{yy}+\dfrac{l(y)}{y}u_y=0$},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {86--92},
     year = {1978},
     volume = {15},
     number = {15},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1978_15_15_a11/}
}
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