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"Wilf classification of three and four letter signed patterns."
W. M. B. Dukes, Toufik Mansour, Astrid Reifegerste (2008)
- W. M. B. Dukes, Toufik Mansour, Astrid Reifegerste:
Wilf classification of three and four letter signed patterns. Discret. Math. 308(15): 3125-3133 (2008)
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