Matsuyama, Takashi. SIGMA: A knowledge-based aerial image understanding system /Takashi Matsuyama and Vincent Shang-Shouq Hwang - New York Plenum 1990 - xvi, 271p incl.bib.ref & ind. - Advances in Computer Vision and Machine Intelligence . ISBN: 030643301x Dewey Class. No.: 006.3 / N9029