?url_ver=Z39.88-2004&rft_id=10.1007%2FBF00941179&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Valyi%2C+I.&rft.aulast=Valyi&rft.aufirst=I.&rft.issue=3&rft.volume=55&rft.date=December+1987&rft.issn=0022-3239&rft.atitle=Approximate+saddle-point+theorems+in+vector+optimization&rft.title=Journal+of+Optimization+Theory+and+Applications&rft.pages=435-448&rft.genre=article