Alves, M.J., Dempe, S. and Júdice, J.J. (2012). Computing the Pareto frontier of a bi-objective bi-level linear problem using a multi-objective mixed-integer programming algorithm. Optimization, 61, 335-358.
 Dempe, S. (2002). Foundations of bi-level programming. Non-convex optimization and its applications, Dordrecht, Kluwer.
 Candler, W., and Norton, R. (1977). Multi-level programming and development policy, Washington, D.C, The World Bank.
 Candler, W., and Townsley, R. (1982). A linear two-level programming problem. Computers and Operations Research, 9, 59-76.
 Bialas, W.F. and Karwan, M.H. (1984). Two-level linear programming. Management science, 30, 1004-1020.
 Edmunds, T. A., and Bard, J. F. (1991). Algorithms for nonlinear bi-level mathematical programs. Systems, Man and Cybernetics, IEEE Transactions on Systems, 21, 83-89.
 Lai, Y.J. (1996). Hierarchical optimization: a satisfactory solution. Fuzzy Sets and Systems, 77, 321-335.
 Calvete, H.I. and Galé, C. (2011). On linear bi-level problems with multiple objectives at the lower level. Omega, 39, 33-40.
 Shi, X., and Xia, H. (1997). Interactive bi-level multi-objective decision-making. Journal of the operational research society, 48, 943-949.
 Abo-Sinna, M. A. and Baky, I.A. (2007). Interactive balance space approach for solving multi-level multi-objective programming problems. Information Sciences, 177, 3397-3410.
 Farahi, M. H. (2010). A new approach to solve multi-objective linear bi-level programming problems. Journal of Mathematics and Computer Sciences, 1, 313-320.
 Pieume, C.O., Marcotte, P., Fotso, L.P. and Siarry, P. (2011). Solving bi-level linear multi-objective programming problems. American Journal of Operations Research, 1, 214-219.
 Lachhwani, K. and Poonia, M.P. (2012). Mathematical solution of multilevel fractional programming problem with fuzzy goal programming approach. Journal of Industrial Engineering International, 8, 1-11.
 Alves, M.J. and Clımaco, J. (2004). A note on a decision support system for multi-objective integer and mixed-integer programming problems. European Journal of Operational Research, 155, 258-265.
 Mersha, A. G. and Dempe, S. (2006). Linear bi-level programming with upper level constraints depending on the lower level solution. Applied Mathematics and Computation, 180, 247-254.
 Ehrgott, M. (2006). Multi-criteria optimization. Berlin, Springer.
 Alves, M.J. and Clı́maco, J. (2000). An interactive reference point approach for multi-objective mixed-integer programming using branch-and-bound. European Journal of Operational Research, 124, 478-494.
 Bard, J. F. (1999). Practical Bi-level Optimization: Algorithms and Applications, Berlin, Springer.
 Wierzbicki, A.P. (1980). The use of reference objectives in multi-objective optimization. In Multiple criteria decision making theory and application (pp. 468-486). Springer Berlin Heidelberg.
 Charnes, A. and Cooper, W. W. (1962). Programming with linear fractional functional. Naval Research logistics quarterly, 9, 181-186.
 Chakraborty, M. and Gupta, S. (2002). Fuzzy mathematical programming for multi objective linear fractional programming problem. Fuzzy sets and systems, 125, 335-342.