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4. Bodlaendera, H.L., Kloksb, T., Tana,c, R.B., Leeuwena, J.V.: Approximations for λ-Coloring of Graphs. a Utrecht University, The Netherlands, b Vrije Universiteit, The Netherlands, c University of Sciences & Arts of Oklahoma, OK 73018, U.S.A
5. Fotakis, D.A., Nikoletseas, S.E., Papadopoulou, V.G., Spirakis, P.G.: NP-Completeness Results and Efficient Approximations for Radiocoloring in Planar Graphs. Journal of Theoretical Computer Science (to appear)