Multi-step preconditioned iteration method for nonsymmetric linear systems. - Toshiyuki Kohno; Hiroshi Niki; Masataka Usui (Int. J. Comput. Math., 1995)

On the preconditioned sor method. - Masataka Usui; Toshiyuki Kohno; Hiroshi Niki (Int. J. Comput. Math., 1995)

An extended GS method for dense linear systems. - Hiroshi Niki; Toshiyuki Kohno; Kuniyoshi Abe (J. Comput. Appl. Math., 2009)

Letter to the Editor: A note on the preconditioned Gauss-Seidel (GS) method for linear systems. - Toshiyuki Kohno; Hiroshi Niki (J. Comput. Appl. Math., 2010)

Comment on 'A comparison theorem of the SOR iterative method'. - Hiroshi Niki; Toshiyuki Kohno (J. Comput. Appl. Math., 2010)