By Grobler J.J.   de Pagter B.   Rambane D.T.   in Quaestiones Mathematicae

ISSN:1727-933X|26|3|307-319

Taylor & Francis Ltd‎(2003)‎

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By Dodds P.   de Pagter B.   Sedaev A.   Semenov E.   Sukochev F.   in Journal of Mathematical Sciences

ISSN:1072-3374|124|2|4867-4885

Springer Publishing Company ‎(2004)‎

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