By Nyholm P.   Rao S.   Duffy H.   in Circuit World

ISSN:0305-6120|20|2|14-20

Emerald Group Publishing Ltd‎(1993)‎

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By Duffy H.S.   Delmar M.   Spray D.C.   in Journal of Physiology-Paris

ISSN:0928-4257|96|3|243-249

Elsevier‎(2002)‎

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