1. H. Greenberg, Mathematical Programming Glossary, World Wide Web, http://www.cudenver.edu/~hgreenbe/glossary/glossary.html, 1996–2001.
2. Linear and Nonlinear Programming;Luenberger,1989
3. Real Analysis;Royden,1988
4. An algorithm for linearly constrained piecewise lexicographic programming problems;Ukovish;J. Optim. Theory Appl.,2001