@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/}
}