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"Walks confined in a quadrant are not always D-finite."
Mireille Bousquet-Mélou, Marko Petkovsek (2003)
- Mireille Bousquet-Mélou, Marko Petkovsek:
Walks confined in a quadrant are not always D-finite. Theor. Comput. Sci. 307(2): 257-276 (2003)
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