On the hull sets and hull number of the cartesian product of graphs. - Gilbert B. Cagaanan; Sergio R. Canoy Jr. (Discret. Math., 2004)

On the Hull Number of the Composition of Graphs. - Sergio R. Canoy Jr.; Gilbert B. Cagaanan (Ars Comb., 2005)

On the Geodetic Covers and Geodetic Bases of the Composition G[Km]. - Gilbert B. Cagaanan; Sergio R. Canoy Jr. (Ars Comb., 2006)