@article{ZNSL_1991_196_a5,
     author = {A. V. Ivanov and P. Z. Mkrtchian},
     title = {On regularity up to the boundary of weak solutions of the first boundary value problem for quazilinear doubly degenerate equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {83--98},
     publisher = {mathdoc},
     volume = {196},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_196_a5/}
}