@article{GDZPPN002309599,
title = {The Total Variation of Solutions of Parabolic Differential Equations and a Maximum Principle in Unbounded Domains.},
journal = {Mathematische Annalen},
volume = {212},
year = {1974},
pages = {57-68},
zbl = {0267.35053},
url = {http://dml.mathdoc.fr/item/GDZPPN002309599}
}
Redheffer, R.M.; Walter, W. The Total Variation of Solutions of Parabolic Differential Equations and a Maximum Principle in Unbounded Domains.. Mathematische Annalen, Tome 212 (1974) pp. 57-68. http://gdmltest.u-ga.fr/item/GDZPPN002309599/