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De Santis, R. M., & Porter, W. A. (1982). Optimization problems in partially ordered Hilbert resolution spaces. International Journal of Control, 36(5), 875-883. Lien externe
Porter, W. A., & De Santis, R. M. (1982). Angular factorization of matrices. Journal of Mathematical Analysis and Applications, 88(2), 591-603. Lien externe
