@article{DAN_1967_177_4_a6,
     author = {I. P. Kostenko},
     title = {The reflexivity of certain unions of semiordered spaces},
     journal = {Doklady Akademii Nauk},
     pages = {774--777},
     year = {1967},
     volume = {177},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_4_a6/}
}