1. On quadratic programming;Beale;Naval Research Logistics Quarterly,1959
2. M. Campêlo, S. Scheimberg, An analysis of the bilevel linear problem by a penalty approach, Technical Report ES-479/98, Engenharia de Sistemas e Computação, Universidade Federal do Rio de Janeiro, 1998
3. M. Campêlo, S. Scheimberg, A note on a modified simplex approach for solving bilevel linear programming problems, Technical Report ES-480/98, Engenharia de Sistemas e Computação, Universidade Federal do Rio de Janeiro, 1998
4. A modified simplex approach for solving bilevel linear programming problems;Önal;European Journal of Operational Research,1993