MathSciNet bibliographic data MR2207500 (2007a:55011) 55P43 (55N91 55P10 57R19) Klein, John R. Fiber products, Poincaré duality and $A\sb \infty$$A\sb \infty$-ring spectra. Proc. Amer. Math. Soc. 134 (2006), no. 6, 1825–1833 (electronic). Article

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