Geodesic
The Number Of Antichains Of Finite Power Sets
Publications de l'Institut Mathématique, _N_S_13 (1972) no. 27, p. 5 
Dragoš M. Cvetković. The Number Of Antichains Of Finite Power Sets. Publications de l'Institut Mathématique, _N_S_13 (1972) no. 27, p. 5 . http://geodesic.mathdoc.fr/item/PIM_1972_N_S_13_27_a0/
@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 },
     year = {1972},
     volume = {_N_S_13},
     number = {27},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_13_27_a0/}
}
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