Dhillon, I.; Sra, S.: Modeling Data using Directional Distributions. University of Texas: Department of Computer Science, Austin, TX, USA (2003), 21 S.

Blanz, V.; Vetter, T.: Method and apparatus for the processing of images. US6556196B1 (2003)

Blanz, V.; Vetter, T.: Method and device for the processing of images based on morphable models. US6556196B1 (2003)

Oeltermann, A.: Methods and devices for measuring electrical currents. EP1273922A1 (2003)