Resumen de Optimality conditions for the linear fractional/quadratic bilevel problem
Herminia I. Calvete, Carmen Galé Pola 
Bilevel programs are optimization problems which have a subset of their variables constrained to be an optimal solution of another problem parameterized by the remaining variables. They have been applied to decentralized planning problems involving a decision process with a hierarchical structure. This paper considers the linear fractional/quadratic bilevel programming (LFQBP) problem, in which the first level objective function is linear fractional, the second level objective function is quadratic and the common constraint region is a polyhedron. For this problem, optimality conditions are derived based on Karush-Kuhn-Tucker conditions and duality theory.
