By Banakh Taras   Verbitsky Oleg   Vorobets Yaroslav   in American Mathematical Monthly

ISSN:1930-0972|117|9|786-800

Mathematical Association of America‎(2010)‎

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By Zontak Alla   Sideman Samuel   Verbitsky Oleg   Beyar Rafael   in Annals of Biomedical Engineering

ISSN:0090-6964|26|6|988-993

Springer Publishing Company ‎(1998)‎

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