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==References==
*{{cite journal|mr=0283792|last=Boothby| first=William M.|title=On two classical theorems of algebraic topology|journal=[[Amer. Math. Monthly]]|volume= 78|year=1971|issue=3 |pages=237–249|doi=10.2307/2317520 |jstor=2317520}}
*{{cite book|mr=0861409|last=Boothby|first= William M. |title=
An introduction to differentiable manifolds and Riemannian geometry|edition=Second|series= Pure and Applied Mathematics|volume= 120|publisher= Academic Press|year= 1986|isbn= 0-12-116052-1}}
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