1. Abdel-Aziz, Y., andKarara, H. M. (1971): ‘Direct linear transformation from comparator coordinates into object-space coordinates.’Close-range photogrammetry, Proc. ASP, Urbana, Illinois, pp. 1–18
2. Brügger, W., andMilner, M. (1978): ‘Computer-aided tracking of body motions using a c.c.d.-image sensor,’Med. & Biol. Eng. & Comput.,16, pp. 207–210
3. Chao, E. Y., An, K. N., Askew, L. J., andMorrey, B. F. (1980): ‘Electrogoniometer for the measurement of human elbow joint rotation,’J. Biomech. Eng.,102, pp. 301–310
4. Chernov, N. I., andOsoskov, G. A. (1984): Effective algorithms for circle fitting,Computer Physics Comm.,33, pp. 329–333
5. Dinn, D. F., Winter, D. A., andTrenholm, B. G. (1970): ‘CINTEL—computer interface for television,’IEEE Trans.,C-19, pp. 1091–1095