no. 2
Retracts of the Sorgenfrey line
Compositio Mathematica, Tome 38 (1979) no. 2, pp. 155-161. 
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     title = {Retracts of the {Sorgenfrey} line},
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     number = {2},
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     mrnumber = {528838},
     zbl = {0408.54004},
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     url = {http://www.numdam.org/item/CM_1979__38_2_155_0/}
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Van Douwen, Eric K. Retracts of the Sorgenfrey line. Compositio Mathematica, Tome 38 (1979) no. 2, pp. 155-161. http://www.numdam.org/item/CM_1979__38_2_155_0/

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