@article{PIM_1972_N_S_13_27_a0,
     author = {Drago\v{s} M. Cvetkovi\'c},
     title = {The {Number} {Of} {Antichains} {Of} {Finite} {Power} {Sets}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {5 },
     publisher = {mathdoc},
     volume = {_N_S_13},
     number = {27},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_13_27_a0/}
}