@article{TM_1970_110_a4,
     author = {N. M. Ivochkina and A. P. Oskolkov},
     title = {Nonlocal estimates of the first derivatives of the solutions of the first boundary value problem for certain classes of nonuniformly elliptic and nonuniformly parabolic equations and systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {65--101},
     publisher = {mathdoc},
     volume = {110},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1970_110_a4/}
}