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@article{PIM_1968_N_S_08_22_a13, author = {R. Daci\'c}, title = {A {Structure} {On} {A} {Set} {Of} {Subsets}}, journal = {Publications de l'Institut Math\'ematique}, pages = {97 }, publisher = {mathdoc}, volume = {_N_S_08}, number = {22}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a13/} }
R. Dacić. A Structure On A Set Of Subsets. Publications de l'Institut Mathématique, _N_S_08 (1968) no. 22, p. 97 . http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a13/