1. Bondy, J.A., Murty, U.S.R. Graph Theory. Springer, Berlin, 2008
2. Broersma, H.J., Fujisawa, J., Yoshimoto, K. Backbone coloring along perfect matchings. https://www.researchgate.net/publication/228724368 Backbone colorings along perfect matchings, or http://purl.utwente.nl/publications/65891
3. Broersma, H., Fomin, F.V., Golovach, P.A., Woeginger, G.J. Backbone coloring for graphs: tree and path backbone. J. Grpah Theory, 55(2): 137–152 (2007)
4. Broersma, H.J., Marchal, L., Paulusma, D., Salman, A.N.M. Improved upper bounds for λ-backbone colorings along matchings and stars. SOFSEM 2007: Theory and Practice of Computer Science, 4362: 188–199 (2007)
5. Broersma, H.J., Marchal, L., Paulusma, D. Backbone colorings along stars and matchings in split graphs: their span is close to the chromatic number. Discuss. Math. Graph Theory, 29(1): 143–162 (2009)