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@article{PIM_1977_N_S_22_36_a19, author = {{\DJ}uro Kurepa}, title = {Ramified {Sets} {Of} {Pseudotrees}}, journal = {Publications de l'Institut Math\'ematique}, pages = {149 }, publisher = {mathdoc}, volume = {_N_S_22}, number = {36}, year = {1977}, url = {http://geodesic.mathdoc.fr/item/PIM_1977_N_S_22_36_a19/} }
Đuro Kurepa. Ramified Sets Of Pseudotrees. Publications de l'Institut Mathématique, _N_S_22 (1977) no. 36, p. 149 . http://geodesic.mathdoc.fr/item/PIM_1977_N_S_22_36_a19/