@article{AA_1994_6_3_a7,
     author = {P. G. Grinevich and S. P. Novikov},
     title = {String {equation.~II.} {Physical} solution},
     journal = {Algebra i analiz},
     pages = {118--140},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1994_6_3_a7/}
}