By Steyn P. S.   Odendaal H. J.   Schoeman J.   Stander C.   Fanie N.   Grové D.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|23|2|150-155

Informa Healthcare‎(2003)‎

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By Stander C.J.   Heyns P.S.   Schoombie W.   in Mechanical Systems and Signal Processing

ISSN:0888-3270|16|6|1005-1024

Academic Press‎(2002)‎

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