@article{TIMM_2010_16_1_a4,
     author = {N. V. Velichko},
     title = {Maps of the {Sorgenfrey} line},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {52--56},
     year = {2010},
     volume = {16},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2010_16_1_a4/}
}