@article{ZNSL_1968_11_a0,
     author = {N. M. Ivochkina and A. P. Oskolkov},
     title = {Nonlocal estimates of the first derivatives of solutions of the first boundary value problem for nonuniformly elliptic and nonuniformly parabolic nondivergence equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {6--72},
     publisher = {mathdoc},
     volume = {11},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_11_a0/}
}