| Article ID: | iaor20128526 |
| Volume: | 57 |
| Issue: | 3-4 |
| Start Page Number: | 306 |
| End Page Number: | 310 |
| Publication Date: | Feb 2013 |
| Journal: | Mathematical and Computer Modelling |
| Authors: | Phuengrattana Withun, Suantai Suthep |
| Keywords: | programming: convex |
We generalize the notion of 