@article{10_4064_ap86_2_6,
     author = {Bo\.zena Pi/atek},
     title = {On convex and $*$-concave multifunctions},
     journal = {Annales Polonici Mathematici},
     pages = {165--170},
     publisher = {mathdoc},
     volume = {86},
     number = {2},
     year = {2005},
     doi = {10.4064/ap86-2-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap86-2-6/}
}