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Bibliography
1978
Schattschneider, Doris and Wallace Walker. M.C. Escher Kaleidocycles.Norfolk, England, 1978: 4, fig. 1.
1981
Bool, F.H. et al. M.C. Escher: His Life and Complete Graphic Work. Amsterdam: Meulenhoff, 1981; English-language edition, New York: Harry N. Abrams, 1982.
1987
Schattschneider 1987, p.27.