Optimal regularity for the parabolic no-sign obstacle type problem. Andersson, J., Lindgren, E., & Shahgholian, H. Interfaces Free Bound., 15(4):477–499, 2013.
bibtex   
@article{MR3148631,
	Author = {Andersson, John and Lindgren, Erik and Shahgholian, Henrik},
	Date-Added = {2019-11-12 20:42:03 +0100},
	Date-Modified = {2019-11-13 07:39:41 +0100},
	Fjournal = {Interfaces and Free Boundaries. Mathematical Analysis, Computation and Applications},
	Issn = {1463-9963},
	Journal = {Interfaces Free Bound.},
	Mrclass = {35R35 (35B65 35K10)},
	Mrnumber = {3148631},
	Mrreviewer = {Elena Comparini},
	Number = {4},
	Pages = {477--499},
	Title = {Optimal regularity for the parabolic no-sign obstacle type problem},
	Volume = {15},
	Year = {2013},
	Bdsk-Url-1 = {https://doi-org.proxy.ub.umu.se/10.4171/IFB/311},
	Bdsk-Url-2 = {https://doi.org/10.4171/IFB/311}}

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