1. Alencar, H., Neto, G.S.: Poincaré and mean value inequalities for hypersurfaces in Riemannian manifolds and applications. arXiv:1502.01407
2. Andreou, E., Dassios, G., Polyzos, D.: Korn’s constant for a spherical shell. Q. Appl. Math. 46, 583–591 (1980)
3. Bandle, C.: Isoperimetric Inequalities and Applications. Pitman Publishing, London (1980)
4. Bricknell, F., Clark, R.S.: Differential Manifolds. An Introduction. van Nostrand Reinhold, London (1970)
5. Cheeger, J.: A lower bound for the smallest eigenvalue of the Laplacian. In: Papers Dedicated to Salomon Bochner 1969, pp. 195–199. Princeton University Press, Princeton (1970)