1. E-convex sets, E-convex Functions and E-convex programming;Youness;Journal of Optimization Theory and Applications,1999
2. Optimality criteria in E-convex programming;Youness;Journal of Chaos, Solitons & Fractals,2001
3. Six kinds of roughly convex functions;Phu;Journal of Optimization Theory and Applications,1997
4. Convex transformable programming problems and invexity;Hanson;Journal of Information and Optimization Science,1987
5. On sufficient of Kuhn-Tucker conditions;Hanson;Journal of Mathematical Analysis and Applications,1981