@article{DE_1994_30_10_a9,
     author = {E. I. Ganzha},
     title = {Higher {Lie{\textendash}B\"acklund} symmetries of diagonal systems of hydrodynamic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1725--1730},
     year = {1994},
     volume = {30},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_10_a9/}
}