MathSciNet bibliographic data MR752487 (85k:55012) 55Q52 (55P45 55S45) Zabrodsky, A. On the realization of invariant subgroups of $\pi \sb\ast (X)$$\pi \sb\ast (X)$. Trans. Amer. Math. Soc. 285 (1984), no. 2, 467–496. Article

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