@article{RM_1998_53_3_a11,
     author = {N. S. Bakhvalov and O. V. Besov and S. M. Nikol'skii and M. K. Potapov},
     title = {Petr {Lavrent'evich} {Ul'yanov} (on his seventieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {645--655},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1998_53_3_a11/}
}