Grove K, Verdiani L, Wilking B, Ziller W. Non-negative curvature obstructions in cohomogeneity one and the Kervaire spheres . Annali Scienze [Internet]. 2009Dec.4 [cited 2025May27];5(2):159-70. Available from: http://20.103.181.36/index.php/annaliscienze/article/view/95