Graf, K. C. (1995). Realistic landscape rendering using remote sensing images, digital terrain models and 3D objects. Dept. of Geography, Remote Sensing Laboratories, University of Zurich-Irchel.

Graf, K. Christoph. Realistic Landscape Rendering Using Remote Sensing Images, Digital Terrain Models and 3D Objects. Zurich, Switzerland: Dept. of Geography, Remote Sensing Laboratories, University of Zurich-Irchel, 1995.

Graf, K. Christoph. Realistic Landscape Rendering Using Remote Sensing Images, Digital Terrain Models and 3D Objects. Dept. of Geography, Remote Sensing Laboratories, University of Zurich-Irchel, 1995.