@article{PIM_1989_N_S_45_59_a3,
     author = {{\DJ}uro Kurepa},
     title = {Order {Preserving} or {Increasing} {Mappings} {Freedom} or {Incomparability} {Preserving} {Mappings}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {17 },
     publisher = {mathdoc},
     volume = {_N_S_45},
     number = {59},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1989_N_S_45_59_a3/}
}