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This paper is devoted to the study of some preconditioned conjugate gradient algorithms on parallel computers. The considered preconditioners (presented in [J. Straubhaar, Preconditioners for the conjugate gradient algorithm using Gram–Schmidt and least squares methods, Int. J. Comput. Math. 84 (1) (2007) 89–108]) are based on incomplete Gram–Schmidt orthogonalization and least squares methods. The...
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