Butler groups, valuated vector spaces, and duality
Rendiconti del Seminario Matematico della Università di Padova, Tome 72 (1984), pp. 13-19. 
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     author = {Richman, Fred},
     title = {Butler groups, valuated vector spaces, and duality},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {13--19},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {72},
     year = {1984},
     mrnumber = {778329},
     zbl = {0576.20033},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1984__72__13_0/}
}
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Richman, Fred. Butler groups, valuated vector spaces, and duality. Rendiconti del Seminario Matematico della Università di Padova, Tome 72 (1984), pp. 13-19. http://www.numdam.org/item/RSMUP_1984__72__13_0/

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