BM Bui-Xuan, M Habib, M Rao - European Journal of Combinatorics, 2012 - core.ac.uk
B.-M. Bui-Xuan et al./European Journal of Combinatorics 33 (2012) 688–711 689 2-
structure. From our results on set families, we show for any digraph, resp. 2-structure, a …