1. Allamandola, L.J., Bernstein, M.P. and Sanford, S.A. (1997), in Cosmovici, C.B., Bowyer, S. and Wertheimer, D. (eds.), Astronomical and Biochemical Origins and the Search for Life in the Universe, Editrici Compositori, Bologna, p.23.
2. Biham, O., Furman, I., Katz, N., Pirronello, V. and Vidali, G. (1998), MNRAS, 296, 869.
3. Biham, O., Furman, I., Pirronello, V. and Vidali, G. (2001), ApJ, 553, 595.
4. Boogert, A.C.A. et al. (2000), A&A, 353, 349.
5. Bruch, L.W., Cole, M.W., Zaremba, E. (1997), Physical Adsorption: Forces and Phenomena, Oxford Science Publications.