Velasco, Pedro Pablo Pérez, and Juan de Lara. “A Reformulation of Matrix Graph Grammars With Boolean Complexes”. The Electronic Journal of Combinatorics 16, no. 1 (June 19, 2009): R73. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1r73.