On the hole index of L(2, 1)-labelings of r-regular graphs. - Sarah Spence Adams; Matthew Tesch; Denise Sakai Troxell; Bradford Westgate; Cody Wheeland (Discret. Appl. Math., 2007)

On island sequences of labelings with a condition at distance two. - Sarah Spence Adams; Alex Trazkovich; Denise Sakai Troxell; Bradford Westgate (Discret. Appl. Math., 2010)