Random patterns generated by random permutations of natural numbers G. Oshanin, R. Voituriez, S. Nechaev, O. Vasilyev and F. Hivert Eur. Phys. J. Special Topics, 143 (2007) 143-157 Published online: 12 May 2007 DOI: 10.1140/epjst/e2007-00082-2