@article{IM2_1997_61_5_a1,
     author = {L. A. Kamynin and B. N. Khimchenko},
     title = {On a~weak (algebraic) extremum principle for a~second-order parabolic system},
     journal = {Izvestiya. Mathematics },
     pages = {933--959},
     publisher = {mathdoc},
     volume = {61},
     number = {5},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1997_61_5_a1/}
}