@article{DAN_1981_261_3_a4,
     author = {M. A. Sall' and V. B. Matveev},
     title = {Nonlocal analogues of the {Korteweg--de} {Vries} and {Kadomtsev--Petviashvili} equations},
     journal = {Doklady Akademii Nauk},
     pages = {533--537},
     publisher = {mathdoc},
     volume = {261},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_3_a4/}
}