@article{CM_1971__23_2_185_0,
     author = {Heath, Robert W. and Michael, Ernest A.},
     title = {A property of the {Sorgenfrey} line},
     journal = {Compositio Mathematica},
     pages = {185--188},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {2},
     year = {1971},
     mrnumber = {287515},
     zbl = {0219.54033},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1971__23_2_185_0/}
}