1. Cates, M. E., Wittmer, J. P., Bouchaud, J.-P. & Claudin, P. Phys. Rev. Lett. 81, 1841–1844 (1998).
2. Bouchaud, J.-P., Cates, M. E. & Claudin, P. J. Phys. I (Fr.) 5,639-656 (1995).
3. Wittmer, J. P., Cates, M. E. & Claudin, P. J. Phys. I (Fr.) 7,39-80 (1997).
4. Savage, S. Powders and Grains 97 (eds Behringer, R. P. & Jenkins, J. T.) 185-194 (Balkema, Rotterdam, 1997).
5. Cantelaube, F. & Goddard, J. D. Powders and Grains 97 (eds Behringer, R. P. & Jenkins, J. T.) 231-234 (Balkema, Rotterdam, 1997).