@techreport{HegeHoellererStalling1993, author = {Hans-Christian Hege and Tobias H{\"o}llerer and Detlev Stalling}, title = {Volume Rendering - Mathematicals Models and Algorithmic Aspects.}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {TR-93-07}, language = {eng}, year = {1993} }