1. Billionnet, A., Djebali, K.: Résolution d’un problème combinatoire fractionnaire par la programmation linaire mixte. RAIRO. Rech. Opér. 40, 97–111 (2006)
2. Chen, D.Z., Daescu, O., Dai, Y., Katoh, N., Wu, X., Xu, J.: Efficient algorithms and implementations for optimizing the sum of linear fractional functions, with applications. J. Comb. Optim. 9(1), 69–90 (2005)
3. Doval, D., Mancoridis, S., Mitchell, B.S.: Automatic clustering of software systems using a genetic algorithm. In: Proceedings of 1999 IEEE International Conference on Software Tools and Engineering Practice (STEP’99), Pittsburgh, PA, pp. 73–81 (1999)
4. Garey, M.R., Johnson, D.S.: Computers and Intractability: A Guide to the Theory of NP-Completeness. Freeman, New York (1979)
5. Gay, D.M.: In: IBM ILOG CPLEX, User’s Manual for CPLEX v12.1 (2009)