System and Method for Fast Polyhedral Cell Sorting.
J. Klosowski, C. Silva, G. Taubin, P. Willians, J. Mitchell, J. Comba.
United States Patent No IS 6,356,262 B1, March, 12, 2002.

Real-Time Volume Rendering of Dynamic Data Using Graphics Hardware
Binotto, A.P.D.; Comba, J.L.D. & Freitas, C.M.D.S.
Scientia, 2002, 13-2, 31-42

Smart Visible Sets for Networked Virtual Environments
Moreira, F.O.; Comba, J.L.D. & Freitas, C.M.D.S.
Proceedings of XV SIBGRAPI 2002. Pages 373-380. IEEE Press ISBN 0-7695-1846-X, Fortaleza, Brazil, October 2002.