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@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/} }
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/