Butler groups cannot be classified by certain invariants
Rendiconti del Seminario Matematico della Università di Padova, Tome 90 (1993), pp. 67-79. 
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     author = {Hill, Paul and Megibben, Charles},
     title = {Butler groups cannot be classified by certain invariants},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {67--79},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {90},
     year = {1993},
     mrnumber = {1257133},
     zbl = {0808.20044},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1993__90__67_0/}
}
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Hill, Paul; Megibben, Charles. Butler groups cannot be classified by certain invariants. Rendiconti del Seminario Matematico della Università di Padova, Tome 90 (1993), pp. 67-79. http://www.numdam.org/item/RSMUP_1993__90__67_0/

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