MathSciNet bibliographic data MR288773 57.10 Porter, Don An algebraic proof that \$[\Omega \sp{U}]\sb{2}={\germ N}\sp{2}\$$[\Omega \sp{U}]\sb{2}={\germ N}\sp{2}$. Proc. Amer. Math. Soc. 31 1972 605–608. Article

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