@Article{Hutter_Kohlhase:2000,
        AUTHOR = {Hutter, Dieter and Kohlhase, Michael},
        TITLE = {Managing Structural Information by Higher-Order Colored Unification},
        YEAR = {2000},
        JOURNAL = {Journal of Automated Reasoning},
        VOLUME = {25},
        PAGES = {123-164} }
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