Symmetry analysis and exact solutions of one class of (1+3)-dimensional   boundary-value problems of the Stefan type
  We present the group classification of one class of (1+3)-dimensional nonlinear boundary-value problems of the Stefan type that simulate the processes of melting and evaporation of metals. The results obtained are used for the construction of the exact solution of one boundary-value problem from the class under study. 
S. S. Kovalenko
math-ph math.MP