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

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