%A Earnshaw, Rae A. %A Parslow, R. D. %A Woodwark, John %A Unicom Seminars Ltd %A British Computer Society. Computer Graphics and Displays Group %T Geometric modelling and computer graphics : techniques and applications %I Technical Press %D 1987 %S The Technical Press-Unicom applied information technology reports series %V %U https://ci.nii.ac.jp/ncid/BA04511865