Symmetry and unimodality in t-stack sortable permutations
Journal of Combinatorial Theory Series A
Sorting with two ordered stacks in series
Theoretical Computer Science
132-avoiding two-stack sortable permutations, Fibonacci numbers, and Pell numbers
Discrete Applied Mathematics
Simple permutations and algebraic generating functions
Journal of Combinatorial Theory Series A
Sorting with networks of data structures
Discrete Applied Mathematics
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