MathSciNet bibliographic data MR525676 20F99 Hirshon, Ronald The equivalence of $\times \sp{t}C\approx \times \sp{t}D$$\times \sp{t}C\approx \times \sp{t}D$ and $J\times C\approx J\times D$$J\times C\approx J\times D$. Trans. Amer. Math. Soc. 249 (1979), no. 2, 331–340. Article

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