1. Iterative Methods for Sparse Linear Systems;Saad,2003
2. Saad, Y., ILUT: A dual threshold incomplete LU factorization, Numerical Linear Algebra with Applications, 387-402, 1994.
3. Nakajima, K., Parallel Multistage Preconditioners by Extended Hierarchical Interface Decomposition for Ill-Conditioned Problems, Advances in Parallel ComputingVol.19, From Multicores and GPU's to Petascale, IOS press, 99-106, 2010.
4. Nakajima, K., Parallel Preconditioning Methods for Iterative Solvers Based on BILUT(p,d,t), HPC in Asia Poster Session, International Supercomputing Conference (ISC’14), Leipzig, Germany, 2014.
5. MUMPS (a MUltifrontal Massively Parallel sparse direct Solver): http://mumps.enseeiht.fr/(accessed on April 3, 2016).