1. On multigrid methods of the two-level type;Axelsson,1982
2. A general incomplete block-matrix factorization method;Axelsson;Linear Algebra Appl.,1986
3. A multilevel solution method for nine-point difference approximations;Axelsson,1989
4. An algebraic framework for hierarchical basis function multilevel methods or the search for “optimal” preconditioners;Axelsson,1990
5. The method of diagonal compensation of reduced matrix entries and multilevel iterations;Axelsson;J. Comput. Appl. Math.,1991