@conference{FalcaoSPIE03,
 author    = "A. X. Falc{\~{a}}o and L. M. Rocha and J. K. Udupa",
 booktitle = "Proc. of SPIE on Medical Imaging: Visualization, Image-Guided Procedures and Display",
 title     = "A combined approach of shell and shear-warp rendering for efficient volume visualization",
 volume    = "5029",
 month     = "Feb",
 pages     = "569--580",
 year      = "2003"
}