%0 Journal Article %A Díaz Díaz, Jesús Ildefonso %T Estimates of the location of a free boundary for the obstacle and stefan problems obtained by means of some energy methods %D 2008 %@ 1072-947X %U https://hdl.handle.net/20.500.14352/49924 %X In this paper we use some energy methods to study the location (and formation) of a free boundary arising in some unilateral problems, for instance, in the obstacle problem and the Stefan problem. %~