http://www.aero-news.net/index.cfm?do=main.textpost&id=fc099b45-5a3f-47ad-823c-cc336c9793eb
http://www.actualidadaeroespacial.com/default.aspx?where=3&id=1&n=10717
http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNGDGpBUDlIpqM8pE9T1rJDERDB_Yg&url=http://www.ateneadigital.es/RevistaAtenea/REVISTA/articulos/GestionNoticias_13385_ESP.asp
http://www.wired.com/opinion/2013/05/an-insiders-view-of-the-hype-and-realities-of-3-d-printing/
http://www.actualidadaeroespacial.com/default.aspx?where=2&id=1&n=10715