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"Tractable and intractable second-order matching problems."
Kouichi Hirata, Keizo Yamada, Masateru Harao (2004)
- Kouichi Hirata, Keizo Yamada, Masateru Harao:
Tractable and intractable second-order matching problems. J. Symb. Comput. 37(5): 611-628 (2004)
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