1. Akçay, M.B.: All colors shortest path problem on trees. Master’s thesis, Izmir University of Economics, Izmir (2015)
2. Bilge, Y.C., Çağatay, D., Genç, B., Sarı, M., Akcan, H., Evrendilek, C.: All colors shortest path problem (2015). arXiv:1507.06865
3. Dror, M., Haouari, M., Chaouachi, J.: Generalized spanning trees. Eur. J. Oper. Res. 120(3), 583–592 (2000)
4. Feremans, C., Labbé, M., Laporte, G.: A comparative analysis of several formulations for the generalized minimum spanning tree problem. Networks 39(1), 29–34 (2002)
5. Garey, M.R., Johnson, D.S.: Computers and Intractability: A Guide to the Theory of NP-Completeness. Freeman, San Francisco (1979)