Total Flux Estimates for a Finite Element Approximation of the Dirichlet Problem Using the Boundary Penalty Method. John W. Barrett; R.M. Shanahan — 1990 Numerische Mathematik
Finite element approximation of a model reaction - diffusion problem with a non-Lipschitz nonlinearity. John W. Barrett; R.M. Shanahan — 1991 Numerische Mathematik