Gaps in the chromatic spectrum of face-constrained plane graphs. Kobler, Daniel; Kündgen, André — 2001 The Electronic Journal of Combinatorics [electronic only]
Colouring planar mixed hypergraphs. Kündgen, André; Mendelsohn, Eric; Voloshin, Vitaly — 2000 The Electronic Journal of Combinatorics [electronic only]
Coloring with no 2-colored P 4 's. Albertson, Michael O.; Chappell, Glenn G.; Kierstead, H.A.; Kündgen, André; Ramamurthi, Radhika — 2004 The Electronic Journal of Combinatorics [electronic only]