A. C. Murillo Jana Kosecká José Jesús Guerrero Carlos Sagüés Visual door detection integrating appearance and shape cues. 512-521 2008 56 Robotics and Autonomous Systems 6 http://dx.doi.org/10.1016/j.robot.2008.03.003 db/journals/ras/ras56.html#MurilloKGS08