@article{SMJ2_2017_43_3-4_a0,
     author = {Iliev, Valentin Vankov},
     title = {On a generalization of {Markowitz} preference relation},
     journal = {Serdica Mathematical Journal},
     pages = {211--220},
     publisher = {mathdoc},
     volume = {43},
     number = {3-4},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2017_43_3-4_a0/}
}