@article{00528838,
title = {Dual extremum principles for a homogeneous Dirichlet problem for a parabolic equation.},
journal = {Mathematica Pannonica},
volume = {4},
year = {1993},
pages = {217-223},
zbl = {0824.49033},
language = {en},
url = {http://dml.mathdoc.fr/item/00528838}
}
Wyborski, Jerzy. Dual extremum principles for a homogeneous Dirichlet problem for a parabolic equation.. Mathematica Pannonica, Tome 4 (1993) pp. 217-223. http://gdmltest.u-ga.fr/item/00528838/