By Peternell M.   Pottmann H.   in Journal of Symbolic Computation

ISSN:0747-7171|23|2|255-266

Academic Press‎(1997)‎

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By Muhlthaler H.   Pottmann H.   in Graphical Models

ISSN:1524-0703|65|6|369-384

Elsevier‎(2003)‎

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By     Leopoldseder S.   Pottmann H.   Randrup T.   Wallner J.   in Graphical Models and Image Processing

ISSN:1077-3169|61|2|110-124

Academic Press‎(1999)‎

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