@article{RM_1960_15_6_a13,
     author = {A. D. Aleksandrov and A. V. Pogorelov},
     title = {Nikolay {Vladimirovich} {Efimov} (on the occasion of his fiftieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_6_a13/}
}