1. Valéry P.,L’homme et la coquille (Gallimard, Paris) 1937.
2. See, for example,Philos. Trans. R. Soc. London, Ser. A,343 (1993), pp. 1–154.
3. Hargittai I. andHargittai M., inNexus: Architecture and Mathematics, edited byK. Williams (Edizioni dell’Erba, Fucecchio) 1996, pp. 81–95.
4. Caglioti G.,The Dynamics of Ambiguity (Springer, Heidelberg) 1992.
5. Kroto H. V., Heath J. R., O’Brien S. C., Curl R. F. andSmalley R. E.,Nature,318 (1985) 162.