@INPROCEEDINGS{Martin-ICRA-2002,
  author = {Martin, {\relax Ch}ristian and Thrun, Sebastian},
  title = {Real-Time Acquisition of Compact Volumetric Maps with Mobile Robots},
  booktitle = {IEEE Int. Conf. on Robotics and Automation (ICRA)},
  year = {2002},
  pages = {311--316},
  publisher = {IEEE}
}