@article{PIM_1976_N_S_20_34_a18,
     author = {{\DJ}uro Kurepa},
     title = {On {A} {System} {Of} {All} {Maximal} {Chains} {(Antichains)} {Of} {A} {Graph}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {161 },
     year = {1976},
     volume = {_N_S_20},
     number = {34},
     url = {http://geodesic.mathdoc.fr/item/PIM_1976_N_S_20_34_a18/}
}