W. M. B. Dukes M. F. Flanagan Toufik Mansour Vincent Vajnovszki Combinatorial Gray codes for classes of pattern avoiding permutations. 35-49 2008 396 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2007.12.002 db/journals/tcs/tcs396.html#DukesFMV08