Geodesic
Optimality and Duality for a Class of Nondifferentiable Minimax Fractional Programming Problems
Yugoslav journal of operations research, Tome 19 (2009) no. 1, p. 49 .

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Necessary and sufficient optimality conditions are established for a class of nondifferentiable minimax fractional programming problems with square root terms. Subsequently, we apply the optimality conditions to formulate a parametric dual problem and we prove some duality results.
Classification : 90C32 90C46 90C47
Keywords: Fractional programming, generalized invexity, optimality conditions, duality. 
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     author = {Antoan B\u{a}t\u{a}torescu and Miruna Beldiman and Iulian Antonescu and Roxana Ciumara},
     title = {Optimality and {Duality} for a {Class} of {Nondifferentiable} {Minimax} {Fractional} {Programming} {Problems}},
     journal = {Yugoslav journal of operations research},
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     year = {2009},
     zbl = {1224.90188},
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Antoan Bătătorescu; Miruna Beldiman; Iulian Antonescu; Roxana Ciumara. Optimality and Duality for a Class of Nondifferentiable Minimax Fractional Programming Problems. Yugoslav journal of operations research, Tome 19 (2009) no. 1, p. 49 . http://geodesic.mathdoc.fr/item/YJOR_2009_19_1_a2/