Another property of the Sorgenfrey line
Compositio Mathematica, Tome 24 (1972) no. 3, pp. 359-363. 
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     title = {Another property of the {Sorgenfrey} line},
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     volume = {24},
     number = {3},
     year = {1972},
     mrnumber = {307171},
     zbl = {0239.54015},
     language = {en},
     url = {http://www.numdam.org/item/CM_1972__24_3_359_0/}
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Lutzer, David J. Another property of the Sorgenfrey line. Compositio Mathematica, Tome 24 (1972) no. 3, pp. 359-363. http://www.numdam.org/item/CM_1972__24_3_359_0/

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