1. Nonlinear Programming: Analysis and Methods;Avriel,1976
2. Nonlinear Programming: Theory and Methods;Bazaraa,1993
3. Duality in nonlinear fractional programming;Bector;Z. Oper. Res.,1973
4. C. R. Bector, S. Chandra, and, Abha, On Mixed Duality in Nonlinear Programming, Research report, Faculty of Management, University of Manitoba, Winnipeg, Canada, 1998.
5. Generalized fractional programming duality: A parametric approach;Bector;J. Optim. Theory Appl.,1989