1. Bense M (1965) Aesthetica. Einführung in die neue Ästhetik. Agis, Baden-Baden, 2nd expanded edn 1982
2. Bill M (1949) Die mathematische Denkweise in der Kunst unserer Zeit. Werk 36, 3, Winterthur. English version: The mathematical way of thinking in the visual art of our time. In: Emmer M
3. (ed) (1993) The visual mind: art and mathematics. MIT Press, Cambridge, pp 5-9
4. Bill M (1965) Structure as art? Art as structure? In: Kepes G (ed) Structure in art and in science. Braziller, New York, pp 150–151
5. Birkhoff GD (1933) Aesthetic measure. Harvard University Press, Cambridge