@article {MR2404748,
author = {Kinnunen, Juha and Lindqvist, Peter},
title = {Definition and properties of supersolutions to the porous medium equation},
year = {2008},
journal = {J. Reine Angew. Math.},
volume = {618},
pages = {135--168},
issn = {0075-4102},
mrclass = {35K57},
mrnumber = {MR2404748},
fjournal = {Journal f\"ur die Reine und Angewandte Mathematik. [Crelle's Journal]},
coden = {JRMAA8}
}
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