@article{ZNSL_1993_206_a5,
     author = {A. V. Ivanov and P. Z. Mkrtchan},
     title = {On the regularity in time of weak solutions of quasilinear doubly degenerate parabolic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {78--84},
     publisher = {mathdoc},
     volume = {206},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_206_a5/}
}