@InProceedings{Lee:2013:IWCS2013:ISA-9,
  author    = {Kiyong Lee},
  title     = {Multi-layered Annotation of Non-textual Data for Spatial Information},
  booktitle = {Proceedings of the 9th Joint ISO - ACL SIGSEM Workshop on Interoperable Semantic Annotation},
  month     = {March},
  year      = {2013},
  address   = {Potsdam, Germany},
  publisher = {Association for Computational Linguistics},
  pages     = {15--24},
  url       = {http://www.aclweb.org/anthology/W13-0502}
}