no. 1-2
On the structure of the group scheme ℤ[ℤ/p n ] ×
Compositio Mathematica, Tome 97 (1995) no. 1-2, pp. 253-271. 
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     title = {On the structure of the group scheme $\mathbb {Z}[\mathbb {Z} / p^n]^\times $},
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     pages = {253--271},
     publisher = {Kluwer Academic Publishers},
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     url = {http://archive.numdam.org/item/CM_1995__97_1-2_253_0/}
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Sekiguchi, Tsutomu; Suwa, Noriyuki. On the structure of the group scheme $\mathbb {Z}[\mathbb {Z} / p^n]^\times $. Compositio Mathematica, Tome 97 (1995) no. 1-2, pp. 253-271. http://archive.numdam.org/item/CM_1995__97_1-2_253_0/

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