@article{TMF_2005_144_1_a12,
     author = {S. B. Leble},
     title = {Necessary {Covariance} {Conditions} for a {One-Field} {Lax} {Pair}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {122--132},
     publisher = {mathdoc},
     volume = {144},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2005_144_1_a12/}
}