IEEE Computer Graphics and Applications, 2(2) March 1982
(1982)
Brown, C. (1982)
Brown, C. "PADL-2: a technical summary"
Requicha, A. A. G. and H. B. Voelcker, (1982)
Requicha, A. A. G. and H. B. Voelcker, "Solid Modeling: A Historical Summary and Contemporary Assessment"