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Sabourau, Stéphane (2010). "Local extremality of the Calabi–Croke sphere for the length of the shortest closed geodesic". Journal of the London Mathematical Society. 82 (3): 549–562. arXiv:0907.2223. doi:10.1112/jlms/jdq045. S2CID1156703.
Sabourau, Stéphane (2010). "Local extremality of the Calabi–Croke sphere for the length of the shortest closed geodesic". Journal of the London Mathematical Society. 82 (3): 549–562. arXiv:0907.2223. doi:10.1112/jlms/jdq045. S2CID1156703.