@article{DAN_1960_133_1_a11,
     author = {V. D. Kukin and A. R. Frenkin},
     title = {{\textquotedblleft}Ghost{\textquotedblright} states and the condition of crossing symmetry},
     journal = {Doklady Akademii Nauk},
     pages = {49--51},
     year = {1960},
     volume = {133},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a11/}
}