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Ph. Dagen en Trudy van der Horst, Constant grafiek, Zwolle 2009, nr. 27 ('Ronde vorm met 3 gaatjes/Gaten-ets') en nr. 52 ('Landschap met wielen') : M. Wigley, Constant's New Babylon The Hyper-Architecture of Desire, Rotterdam 1998, p. 193 ('Landschap met spatiofore').