@article{JRAM_1988__390_153060,
     author = {Sigurd Angenent},
     title = {The zero set of a solution of a parabolic equation.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {79--96},
     publisher = {mathdoc},
     volume = {390},
     year = {1988},
     zbl = {0644.35050},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1988__390_153060/}
}