By Attwater D.J.   Whittaker S.J.   in BT Technology Journal

ISSN:1358-3948|17|1|149-159

Springer Publishing Company ‎(1999)‎

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By Madu A. E.   Whittaker S. J.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|26|7|687-688

Informa Healthcare‎(2006)‎

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