@article{JCA_2012_19_1_JCA_2012_19_1_a4,
     author = {M. M. M\"akel\"a and Y. Nikulin and J. Mezei},
     title = {A {Note} on {Extended} {Characterization} of {Generalized} {Trade-Off} {Directions} in {Multiobjective} {Optimization}},
     journal = {Journal of convex analysis},
     pages = {91--111},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/JCA_2012_19_1_JCA_2012_19_1_a4/}
}