By Oliveira J B   Carvalho P Simeão   Mota M F   Quintas M J   in Physics Education

ISSN:0031-9120|50|3|329-334

IOP Publishing‎(2015)‎

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By Sanz E.   Gomez-Lopez T.   Martnez-Quintas M.J.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|95|1|127-131

Elsevier‎(2001)‎

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