@article{IZKAB_2011_6_a1,
     author = {M. KH. Beshtokov},
     title = {Existence and uniqueness of the solution 
},
     journal = {News of the Kabardin-Balkar scientific center of RAS},
     pages = {17--21},
     publisher = {mathdoc},
     number = {6},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IZKAB_2011_6_a1/}
}