@article{RM_1981_36_3_a21,
     author = {A. D. Aleksandrov and Yu. A. Aminov and O. A. Oleinik and A. V. Pogorelov and \`E. G. Poznyak and \`E. R. Rozendorn and I. Kh. Sabitov},
     title = {Nikolai {Vladimirovich} {Efimov} (on his seventieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {271--278},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1981_36_3_a21/}
}