Marker-less Tracking for AR: A Learning-Based Approach, Y. Genc, S. Riedel, F. Souvannavong, C. Akinlar and N. Navab, ISMAR '02: Proceedings of the International Symposium on Mixed and Augmented Reality (ISMAR) 2002 [pdf] 
@inproceedings{genc02marker-less,
    address={Washington, DC, USA}, 
    year={2002}, 
    author={Y. Genc and S. Riedel and F. Souvannavong and C. Akinlar and N. Navab}, 
    isbn={0-7695-1781-1}, 
    bdsk-url-1={http://fabrice.souvannavong.free.fr/Prof/ismar02.pdf}, 
    bdsk-url-2={/publications/papers/genc02marker-less.pdf}, 
    title={Marker-less Tracking for AR: A Learning-Based Approach}, 
    pages={295--304}, 
    publisher={IEEE Computer Society}, 
    booktitle={ISMAR '02: Proceedings of the International Symposium on Mixed and Augmented Reality (ISMAR)}, 
}