Large-gradient and Lagrange singularities of solutions of a quasilinear   parabolic equation
  Asymptotic solutions of a quasilinear parabolic equation with a small parameter at the higher derivative are constructed near large-gradient and Lagrange singularities of A-type, which represent interest for studying processes of shock waves formation in physical media with a small nonzero viscosity. 
Sergei V. Zakharov
math.AP