@article{PIM_1966_N_S_06_20_a16,
     author = {Ladislav Skula},
     title = {The {Subset} {P+} {And} {P-} {Of} {The} {Split} {Interval}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {120 },
     publisher = {mathdoc},
     volume = {_N_S_06},
     number = {20},
     year = {1966},
     url = {http://geodesic.mathdoc.fr/item/PIM_1966_N_S_06_20_a16/}
}