By Higgins SP   McMahon LP   Brennecke SP   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|24|1|83-85

Informa Healthcare‎(2004)‎

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By Higgins S.P.   Vickers A.J.   in Physica E

ISSN:1386-9477|17|unknown|595-596

Elsevier‎(2003)‎

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