Ivan Herman On The Projective Invariant Representation of Conics in Computer Graphics. [Citation Graph (0, 0)][DBLP] Comput. Graph. Forum, 1989, v:8, n:4, pp:301-314 [Journal]
M. Patel A Method for the Representation, Evaluation and Display of CSG Models in PHIGS and PHIGS+. [Citation Graph (0, 0)][DBLP] Comput. Graph. Forum, 1989, v:8, n:4, pp:337-345 [Journal]
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