Megumi Saito Yoichi Sato Katsushi Ikeuchi Hiroshi Kashiwagi Measurement of surface orientations of transparent objects using polarization in highlight. 64-71 2001 32 Systems and Computers in Japan 5 http://dx.doi.org/10.1002/scj.1027 db/journals/scjapan/scjapan32.html#SaitoSIK01