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@article{PIM_1973_N_S_15_29_a7, author = {Milan {\DJ}uri\'c}, title = {Topological {Structures} {On} {Classes} {I}}, journal = {Publications de l'Institut Math\'ematique}, pages = {55 }, publisher = {mathdoc}, volume = {_N_S_15}, number = {29}, year = {1973}, url = {http://geodesic.mathdoc.fr/item/PIM_1973_N_S_15_29_a7/} }
Milan Đurić. Topological Structures On Classes I. Publications de l'Institut Mathématique, _N_S_15 (1973) no. 29, p. 55 . http://geodesic.mathdoc.fr/item/PIM_1973_N_S_15_29_a7/