no. 2
A property of the Sorgenfrey line
Compositio Mathematica, Tome 23 (1971) no. 2, pp. 185-188. 
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     number = {2},
     year = {1971},
     mrnumber = {287515},
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     url = {http://archive.numdam.org/item/CM_1971__23_2_185_0/}
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Heath, Robert W.; Michael, Ernest A. A property of the Sorgenfrey line. Compositio Mathematica, Tome 23 (1971) no. 2, pp. 185-188. http://archive.numdam.org/item/CM_1971__23_2_185_0/

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