@article{DAN_1967_175_2_a12,
     author = {L. Ya. Leifman},
     title = {Algorithm for approximate solution of a problem concerned
},
     journal = {Doklady Akademii Nauk},
     pages = {306--308},
     publisher = {mathdoc},
     volume = {175},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_175_2_a12/}
}