@misc{Bednarczuk_Ewa_M._Proper_2002,
 author={Bednarczuk, Ewa M.},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Raport Badawczy = Research Report},
 howpublished={online},
 year={2002},
 publisher={Instytut Badań Systemowych. Polska Akademia Nauk},
 publisher={Systems Research Institute. Polish Academy of Sciences},
 language={eng},
 abstract={The study investigates tradeoff directions defined as efficient points of the tangent cone. The characteristics of the existence of non-zero directions of exchange are given.},
 title={Proper efficiency via tradeoff directions. Convex case},
 type={Text},
 URL={http://www.rcin.org.pl/Content/99885/PDF/RB-2002-48.pdf},
 keywords={Efficient points, Tangent cones, Tradeoff directions, Styczne stożkowe},
}