Connected triangle-free m-step competition graphs. - Geir T. Helleloid (Discret. Appl. Math., 2005)

Graph pegging numbers. - Geir T. Helleloid; Madeeha Khalid; David Petrie Moulton; Philip Matchett Wood (Discret. Math., 2009)

Reconstructing a Graph from its Arc Incidence Graph. - Stephen G. Hartke; Geir T. Helleloid (Graphs Comb., 2012)