Front Range Press
International Conference on Boundary and Interior Layers - Computational and Asymptotic Methods
Boundary-value problems, multigrid and defect correction

Hemker, P., & Shishkin, G. (1992). Discrete approximation of singularly perturbed parabolic PDE's with a discontinous initial condition. In Proceedings of the Sixth International Conference on Boundary and Interior Layers - Computational and Asymptotic Methods 1992 (6). Front Range Press.