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2. The Tutte-Grothendieck ring;Brylawski;Algebra Universalis,1972
3. A decomposition for combinatorial geometries;Brylawski;Trans. Amer. Math. Soc.,1972
4. Unities and negations: On the representation of finite lattices;Crapo,1977
5. On the Foundations of Combinatorial Theory: Combinatorial Geometries;Crapo,1970