Cheikh Niang Béatrice Bouchou Moussa Lo Yacine Sam Appropriate global ontology construction: a domain-reference-ontology based approach. 166-173 2011 iiWAS https://doi.org/10.1145/2095536.2095566 conf/iiwas/2011 db/conf/iiwas/iiwas2011.html#NiangBLS11