Achieving Direct Volume Visualization with Interactive Semantic Region Selection. - Terry S. Yoo; Ulrich Neumann; Henry Fuchs; Stephen M. Pizer; Tim J. Cullip; John Rhoades; Ross T. Whitaker (IEEE Visualization, 1991)

Real-Time Procedural Textures. - John Rhoades; Greg Turk; Andrew Bell; Andrei State; Ulrich Neumann; Amitabh Varshney (SI3D, 1992)

Direct visualization of volume data. - Terry S. Yoo; Ulrich Neumann; Henry Fuchs; Stephen M. Pizer; Tim J. Cullip; John Rhoades; Ross T. Whitaker (IEEE Computer Graphics and Applications, 1992)