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@article{MV_1953_5_3-4_a1, author = {{\DJ}. Kurepa}, title = {On some coupled operators in ordered sets}, journal = {Matemati\v{c}ki vesnik}, pages = {15 }, publisher = {mathdoc}, volume = {5}, number = {3-4}, year = {1953}, url = {http://geodesic.mathdoc.fr/item/MV_1953_5_3-4_a1/} }
Đ. Kurepa. On some coupled operators in ordered sets. Matematički vesnik, Tome 5 (1953) no. 3-4, p. 15 . http://geodesic.mathdoc.fr/item/MV_1953_5_3-4_a1/