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Stiny G, Gips J, 1972, "Shape Grammars and the Generative Specification of Painting and Sculpture" in C V Freiman (ed) Proceedings of IFIP Congress 71 (Amsterdam: North-Holland) 1460-1465.  Republished in O R Petrocelli (ed), The Best Computer Papers of 1971 (Philadelphia: Auerbach) 125-135.