@article{JCA_2011_18_3_JCA_2011_18_3_a3,
     author = {B. Kraska and W. Rzymowski},
     title = {Guarding a {Line} {Segment}},
     journal = {Journal of convex analysis},
     pages = {645--671},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JCA_2011_18_3_JCA_2011_18_3_a3/}
}