@article{02216831,
title = {On the antimaximum principle for parabolic periodic problems with weight.},
journal = {Rendiconti del Seminario Matematico},
volume = {60},
year = {2002},
pages = {33-44},
zbl = {1098.35069},
language = {en},
url = {http://dml.mathdoc.fr/item/02216831}
}
Lami Dozo, E.; Godoy, T.; Paczka, S. On the antimaximum principle for parabolic periodic problems with weight.. Rendiconti del Seminario Matematico, Tome 60 (2002) pp. 33-44. http://gdmltest.u-ga.fr/item/02216831/