A note on topological groups
Compositio Mathematica, Tome 3 (1936), pp. 427-430 
@article{CM_1936__3__427_0,
     author = {Birkhoff, Garrett},
     title = {A note on topological groups},
     journal = {Compositio Mathematica},
     pages = {427--430},
     year = {1936},
     publisher = {Johnson Reprint Corporation},
     volume = {3},
     zbl = {0015.00702},
     language = {en},
     url = {https://www.numdam.org/item/CM_1936__3__427_0/}
}
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Birkhoff, Garrett. A note on topological groups. Compositio Mathematica, Tome 3 (1936), pp. 427-430. https://www.numdam.org/item/CM_1936__3__427_0/

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[4] O. Schreier, Abstrakte kontinuierliche Gruppen [Abh. Hamb. 4 (1925), 15-32]. | JFM