@inproceedings{Zobel02:BTD,
title = {Binocular 3-D Object Tracking with Varying Focal Lengths},
booktitle = {IASTED International Conference on Signal Processing, Pattern Recognition, and Application},
author = {Matthias Zobel and Joachim Denzler and Heinrich Niemann},
year = {2002},
pages = {325-330},
}