@article{TMF_1975_23_3_a5,
     author = {V. Z. \`Enol'skii},
     title = {Topological properties of {Landau} curves in connection with {Mandelstam's} conjecture},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {335--347},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_23_3_a5/}
}