Hyperbolic difference operators
Doklady Akademii Nauk, Tome 189 (1969) no. 3, pp. 486-488.

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@article{DAN_1969_189_3_a9,
     author = {L. S. Frank},
     title = {Hyperbolic difference operators},
     journal = {Doklady Akademii Nauk},
     pages = {486--488},
     publisher = {mathdoc},
     volume = {189},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_3_a9/}
}
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L. S. Frank. Hyperbolic difference operators. Doklady Akademii Nauk, Tome 189 (1969) no. 3, pp. 486-488. http://geodesic.mathdoc.fr/item/DAN_1969_189_3_a9/