Ricca Edmondson (1997). The Political Context of Collective Action. Routledge/ECPR Studies in European Political Science. Routledge. p. 42. ISBN 0-203-44967-3. 0-203-44967-3
Charles A. Harper; Edward M. Petrie, eds. (2003). Plastics materials and processes: a concise encyclopedia. John Wiley and Sons. p. 906. ISBN 0-471-45603-9. 0-471-45603-9
"CAO : Dassault Systèmes et Matra Datavision s'entendent sur un " projet de coopération "". 1998-12-09. http://archives.lesechos.fr/archives/1998/LesEchos/17791-62-ECH.htm
"Company | OPEN CASCADE". Archived from the original on 2010-05-19. Retrieved 2009-11-03. https://web.archive.org/web/20100519215306/http://www.opencascade.org/about/profile/history/
BRL-CAD Tutorial Series: Volume 4--Converting Geometry between BRL-CAD and Other Formats. DIANE Publishing. p. 27. ISBN 1-4289-1122-7. 1-4289-1122-7