@article{DAN_1962_143_2_a21,
     author = {L. O. Atovmyan and G. B. Bokii},
     title = {The structure of 
},
     journal = {Doklady Akademii Nauk},
     pages = {342--344},
     publisher = {mathdoc},
     volume = {143},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a21/}
}