MathSciNet bibliographic data MR879570 55T15 (55S10) Shick, Paul On root invariants of periodic classes in ${\rm Ext}_A({\bf Z}/2,{\bf Z}/2)$${\rm Ext}_A({\bf Z}/2,{\bf Z}/2)$. Trans. Amer. Math. Soc. 301 (1987), no. 1, 227–237. Article

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