@article{DAN_1995_340_4_a1,
     author = {I. L. Barskii},
     title = {Exact formulas for the general solution of the equation
},
     journal = {Doklady Akademii Nauk},
     pages = {456--459},
     publisher = {mathdoc},
     volume = {340},
     number = {4},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_340_4_a1/}
}