@article{DAN_1991_321_6_a14,
     author = {M. A. Sychev},
     title = {Erratum: {``A} classical problem of the calculus of variations''},
     journal = {Doklady Akademii Nauk},
     pages = {1128},
     publisher = {mathdoc},
     volume = {321},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_6_a14/}
}