@Other{ApushkinskayaShahgholianUraltseva_2002,
title={On the Lipschitz property of the free boundary for parabolic obstacle problem},
author={Apushkinskaya, Darya and Shahgholian, Henrik and Uraltseva, Nina},
doi={http://dx.doi.org/10.22028/D291-26227},
year={2002}
}