@article{DE_1981_17_10_a0,
     author = {N. P. Erugin and V. A. Il'in and A. A. Samarskii and A. G. Sveshnikov},
     title = {Andreǐ {Nikolaevich} {Tikhonov} (on the occasion of his seventy-fifth birthday)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1731--1737},
     year = {1981},
     volume = {17},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_10_a0/}
}