By García M.   Magret M.   Tarragona S.   in Journal of Mathematical Sciences

ISSN:1072-3374|144|2|3904-3908

Springer Publishing Company ‎(2007)‎

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By Puerta F.   Puerta X.   Tarragona S.   in Linear Algebra and its Applications

ISSN:0024-3795|379|unknown|329-343

Elsevier‎(2004)‎

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