Z. Lin, M. Hashimoto, K. Takigawa, and K. Takahashi. 2018 25th International Conference on Mechatronics and Machine Vision in Practice (M2VIP), page 1-6. (November 2018)
B. Höfle, and M. Hollaus. International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, XXXVIII, page 281-286. Vienna, Austria, (July 2010)