@article{TMF_1992_91_3_a15,
     author = {S. V. Frolov},
     title = {A~spectral identity for the multidimensional {Schr\"odinger} equation with periodic potential},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {524--528},
     publisher = {mathdoc},
     volume = {91},
     number = {3},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_91_3_a15/}
}