@article{DE_1986_22_12_a0,
     author = {A. V. Bitsadze and N. P. Erugin and V. A. Il'in and A. A. Samarskii},
     title = {Andreǐ {Nikolaevich} {Tikhonov} (on the occasion of his eightieth birthday)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2027--2031},
     year = {1986},
     volume = {22},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_12_a0/}
}