 
                                                                                | Article ID: | iaor19921127 | 
| Country: | India | 
| Volume: | 28 | 
| Issue: | 3 | 
| Start Page Number: | 153 | 
| End Page Number: | 164 | 
| Publication Date: | Sep 1991 | 
| Journal: | OPSEARCH | 
| Authors: | Bector C.R., Singh C., Suneja S.K. | 
| Keywords: | programming: multiple criteria | 
The concept of proper efficiency is used to formulate duality theory for multiobjective fractional programming problems under the assumptions of strong and weak invexity, quasiinvexity and pseudoinvexity.