MathSciNet bibliographic data MR1092913 (92h:57025) 57N10 (57N70) Ancel, Fredric D.; Guilbault, Craig R. An extension of Rourke's proof that \$\Omega\sb 3=0\$$\Omega\sb 3=0$ to nonorientable manifolds. Proc. Amer. Math. Soc. 115 (1992), no. 1, 283–291. Article

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