By Matorras R.   Perteagudo L.   Sanjurjo P.   Ruiz J.I.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|83|2|179-184

Elsevier‎(1999)‎

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By Tarefder R   Rodriguez-Ruiz J I   in Transportation Letters: the International Journal of Transportation Research

ISSN:1942-7867|5|3|154-163

Maney Publishing‎(2013)‎

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