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

[1] E.W. Chittenden, On the equivalence of ecart and voisinage [Trans. A. Math. Soc. 18 (1917), 161-166]. | JFM

[2] D. Van Dantzig, Zur topologischen Algebra, I [Math. Annalen 107 (1932), 587-616]. | JFM

[3] H. Freudenthal, Über die Enden topologischer Räume und Gruppen [Math. Zeitschr. 33 (1931), 692-713]. | JFM | Zbl

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