@article{DAN_1986_287_5_a20,
     author = {L. B. Glebov and O. M. Efimov and M. N. Libenson and G. T. Petrovskiǐ},
     title = {New notion about the proper optical
},
     journal = {Doklady Akademii Nauk},
     pages = {1114--1118},
     publisher = {mathdoc},
     volume = {287},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_287_5_a20/}
}