1. Achtelik, M., Bachrach, A., He, R., Prentice, S., & Roy, N. (2009). Stereo vision and laser odometry for autonomous helicopters in gps-denied indoor environments. In SPIE.
2. Artieda, J., Sebastián, J. M., Campoy, P., Correa, J. F., Mondragón, I. F., Martínez, C., & Olivares, M. (2009). Visual 3-d slam from uavs. Journal of Intelligent & Robotic Systems, 55(4–5), 299–321.
3. Baker, S., & Nayar, S. K. (1999). A theory of single-viewpoint catadioptric image formation. International Journal of Computer Vision, 35, 175–196. ISSN 0920-5691. doi: 10.1023/A:1008128724364 .
4. Barreto, J., & Araujo, H. (2001). Issues on the geometry of central catadioptric image formation. In: International conference on pattern recognition.
5. Barrows, G., Neely, C., & Miller, K. (2001). Optic flow sensors for mav navigation. AIAA Journal, 195, 557–574.