http://springerlink.metapress.com/content/91605877121113k5/fulltext.pdf
A model for synchronous collaborative design using CAD and database management
http://springerlink.metapress.com/content/p3rmx776m4428039/?p=380c5a80b41e4f8a820c6bad71764aeb&pi=22
Concurrent Engineering based collaborative design Under network environment
http://www.springerlink.com/content/xh851614lp535700/