A characterization of countable Butler groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 51-58. 
@article{RSMUP_1985__74__51_0,
     author = {Bican, L. and Salce, L. and \v{S}t\v{e}p\'an, J.},
     title = {A characterization of countable {Butler} groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {51--58},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {74},
     year = {1985},
     mrnumber = {818715},
     zbl = {0583.20041},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1985__74__51_0/}
}
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Bican, L.; Salce, L.; Štěpán, J. A characterization of countable Butler groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 51-58. http://archive.numdam.org/item/RSMUP_1985__74__51_0/

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