1. Studies in Geometry;Blumenthal,1970
2. Number representations and dragon curves I, II;Davis;J. Recreational Math.,1970
3. Number representations and dragon curves I, II;Davis;J. Recreational Math.,1970
4. Algebraic theory of Penrose's non-periodic tilings of the plane;de Bruijn,1981
5. Disjointness in ergodic theory, minimal sets, and a problem in Diophantine approximation;Furstenberg;Math. Systems Theory,1967