1. Appleyard, J. R. and Cheshire, I. M. 1983.Reservoir Simulation Symposium. Nested factorization, SPE 12264. Nov15-181983, San Francisco. pp.315–324.
2. Parallel algorithms for the solution of certain large sparse linear systems
3. Block Preconditioning for the Conjugate Gradient Method
4. Cosgrove, J. D. F. and Días, J. C. Proceedings of the Second Workshop on Applied Computing. Fully parallel preconditionings for sparse systems of equations. Tulsa, Oklahoma. Edited by: Uselton, S. pp.29–34. The University of Tulsa.