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http://eprints.ucm.es/34396/ http://www.riudg.udg.mx/handle/123456789/62

565 http://aprendeenlinea.udea.edu.co/revistas/

index.php/experimenta/article/viewFile/24592/20129

http://revistas.ucr.ac.cr/index.php/rbt/article/view/20896

http://revistas.ucr.ac.cr/index.php/rbt/article/view/15940

http://revistas.ucr.ac.cr/index.php/rbt/article/view/21736

citashttp://repositorio.ub.edu.ar:8080/xmlui/handle/123456789/3994http://www.citeulike.org/group/15886/article/10001911http://metabase.uaem.mx/handle/123456789/454

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