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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     publisher = {Sijthoff et Noordhoff International Publishers},
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     zbl = {0408.54004},
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     url = {http://archive.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://archive.numdam.org/item/CM_1979__38_2_155_0/

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