1. Aubry, S., ‘Weakly periodic structures and example’,J. Physique (Paris), Coll. C350 (1989), 97–106.
2. Bombieri, E. and Taylor, J., ‘Which distributions of matter diffract? An initial investigation’,J. Physique (Paris), Coll. C347 (1986), 3–19.
3. Bombieri, E. and Taylor, J., ‘Quasicrystals, tilings, and algebraic number theory’,Contemp. Math. 64 (1987), 241–264, Amer. Math. Soc., Providence.
4. Furstenberg, H.,Recurrence in Ergodic Theory and Combinatorial Number Theory, Princeton University Press, Princeton, 1981.
5. Grünbaum, B. and Shephard, G. C.,Tilings and Patterns, Freeman, New York, 1986.