S. Vassilevski, Panayot2018-11-272024-04-222018-11-272024-04-222008978-0-387-71564-3https://drs.ess.gov.et/handle/12345678/24474enMathematics ; Partial differential equations ; Computer mathematics.Multilevel Block Factorization Preconditioners Matrix-based Analysis and Algorithms for Solving Finite Element EquationsBook