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Steingrimsson, Einar and Dukes, Mark and Claesson, Anders (2010) Permutations sortable by n-4 passes through a stack. Annals of Combinatorics, 14. pp. 45-51.
Dukes, W.M.B. and Mansour, Toufik (2007) Signed involutions avoiding 2-letter signed patterns. Annals of Combinatorics, 11 (3-4). pp. 387-403. ISSN 0218-0006
Kitaev, Sergey and Mansour, Toufik (2003) Partially ordered generalized patterns and k-ary words. Annals of Combinatorics, 7 (2). pp. 191-200. ISSN 0218-0006