@article{DAN_1978_240_2_a8,
     author = {V. V. Fedorchuk},
     title = {On ordered sets},
     journal = {Doklady Akademii Nauk},
     pages = {280--282},
     publisher = {mathdoc},
     volume = {240},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_2_a8/}
}