[1] P . P . Dey , S . Pramanik , ” Goal programming approach to linear fractional bilevel programming problem based on Taylor series approximation,” Int . J . Pure Appl . Sci .Technol . 6(2)(2011),115-123.
[2] M . Sakawa , I . Nishizaki , Y . Uemura , ” Interactive fuzzy programming for tow-level linear fractional programming problems with fuzzy parameters ” ,Fuzzy sets and Systems 115(2000),93-103.
[3] M . Sakawa , I . Nishizaki , ” Interactive fuzzy programming for two-level linear fractional programming problems ” , Fuzzy sets and Systems 119(2001),31-40.
[4] M . Sakawa , I . Nishizaki , Y . Uemura , ” Interactive fuzzy programming for tow-level linear and fractional production and assignment problem : A case study,” European Journal of Operational Research 135(2001)142-157.
[5] H . I . Calvete , C . Gale , ” The bilevel linear/linear fractional programming problem ” , European Journal of Operational Research 114(1999)188-197.
[6] H . I . Calvete , C . Gale , ” A note on bilevel fractional programming problem ” , European Journal of Operational Research 152(2004)296-299.
[7] S . Mishra , ” Weighting method for bilevel linear fractional programming ” , European Journal of Operational Research 183(2007)296-302.
[8] M . Borza , A . S . Rambely , M . Saraj , ” A Stackelberg solution to a two-level linear fractional programming problem with interval coefficients in the objective functions ” , Sains Malaysiana 41(21)(2012)1651-1656 .
[9] A . Ren , ” A novel method for solving the fully fuzzy bilevel linear programming problem ” , Mathematical Problems in Engineering, Volumes (2015) , Article ID 280380 , 11 pages.
[10] S. Keikha, A. Payan, B. Rahmani Parchikolaei, ”Solving bi-level linear fractional programming problem by Bi-level linear programming problem: an extension to variable transformation of charnes and cooper ”, International Conference on Nonlinear Modeling & optimization, (2012).
[11] J. Bard, ”Practical bilevel optimization: algorithms and applications” , Kluver Academic Publishers, The Netherlands, USA, (1988).
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