@article{RM_1971_26_1_a5,
     author = {A. D. Aleksandrov and P. S. Aleksandrov and A. V. Pogorelov and \`E. G. Poznyak},
     title = {Nikolai {Vladimirovich} {Efimov} (on the occasion of his sixtieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {205--210},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_1_a5/}
}