A class of preconditioned conjugate gradient methods applied to finite element equations
1979 ◽
Vol 14
(7)
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pp. 1001-1019
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1992 ◽
Vol 44
(1-4)
◽
pp. 189-206
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2003 ◽
Vol 23
(4)
◽
pp. 561-580
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1982 ◽
pp. 502-534
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