Geodesic
Torsion Elements and the Classification of Vector Bundles
Canadian journal of mathematics, Tome 29 (1977) no. 2, pp. 327-332

Voir la notice de l'article provenant de la source Cambridge University Press

There are many situations in algebraic topology when a geometric construction is possible if, and only if, a certain integral cohomology class, an obstruction is zero. When attempts are made to compute the obstruction, it often happens that it is relatively easy to show that m times the obstruction is zero, where m is an integer, and consequently the geometric construction is possible if the cohomology group in question has no elements of order m. 
Little, Robert D. Torsion Elements and the Classification of Vector Bundles. Canadian journal of mathematics, Tome 29 (1977) no. 2, pp. 327-332. doi: 10.4153/CJM-1977-036-0
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