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

Hemker, P. (1980). The incomplete LU-decomposition as a relaxation method in multi-grid algorithms. In Proceedings of International Conference on Boundary and Interior Layers - Computational and Asymptotic Methods 1980 (pp. 306–311). Boole Press.