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"Permutations sortable by two stacks in parallel and quarter plane walks."
Michael H. Albert, Mireille Bousquet-Mélou (2015)
- Michael H. Albert, Mireille Bousquet-Mélou:
Permutations sortable by two stacks in parallel and quarter plane walks. Eur. J. Comb. 43: 131-164 (2015)
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