@article{DAN_1977_236_5_a5,
     author = {L. I. Kamynin and B. N. Khimchenko},
     title = {On a strong extremum principle for degenerating parabolic equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {1060--1063},
     publisher = {mathdoc},
     volume = {236},
     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_5_a5/}
}