IXPHIGS: A Portable Implementation of the International PHIGS Standard. - Jenö Gorog; Gergely Krammer; Árpád Vincze (Eurographics, 1988)

Notes on the Mathematics of the PHIGS Viewing Pipeline. - Gergely Krammer (Comput. Graph. Forum, 1989)

A line clipping algorithm and its analysis. - Gergely Krammer (Comput. Graph. Forum, 1992)