@article{DAN_1979_249_1_a4,
     author = {A. V. Zhiber and N. H. Ibragimov and A. B. Shabat},
     title = {Equations of {Liouville} type},
     journal = {Doklady Akademii Nauk},
     pages = {26--29},
     publisher = {mathdoc},
     volume = {249},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_1_a4/}
}