@article{hinzmann2018ral,
  title={{Free LSD: Prior-Free Visual Landing Site Detection for Autonomous Planes}},
  author={T. Hinzmann and T. Stastny and C. Cadena and R. Siegwart and I. Gilitschenski},
journal={IEEE Robotics and Automation Letters},
volume={3},
number={3},
pages={2545-2552}, 
}