A generalization of Ulm subgroups
Rendiconti del Seminario Matematico della Università di Padova, Tome 58 (1977), pp. 1-7. 
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     author = {Messa, Kenneth},
     title = {A generalization of {Ulm} subgroups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--7},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {58},
     year = {1977},
     mrnumber = {543124},
     zbl = {0417.16016},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1977__58__1_0/}
}
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Messa, Kenneth. A generalization of Ulm subgroups. Rendiconti del Seminario Matematico della Università di Padova, Tome 58 (1977), pp. 1-7. http://archive.numdam.org/item/RSMUP_1977__58__1_0/

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