no. 2
The ⊕ c -topology on abelian p-groups
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 7 (1980) no. 2, pp. 241-256. 
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     author = {D'Este, G.},
     title = {The $\oplus _c$-topology on abelian $p$-groups},
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     pages = {241--256},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 7},
     number = {2},
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     zbl = {0439.20034},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1980_4_7_2_241_0/}
}
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D'Este, G. The $\oplus _c$-topology on abelian $p$-groups. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 7 (1980) no. 2, pp. 241-256. http://archive.numdam.org/item/ASNSP_1980_4_7_2_241_0/

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