1. Alexander, S., Kapovitch, V., Petrunin, A.: Alexandrov Geometry. Book draft (available online)
2. Alexander S., Kapovitch V., Petrunin A.: An optimal lower curvature bound for convex hypersurfaces in Riemannian manifolds. Ill. J. Math. 52(3), 1031–1033 (2008)
3. Alexandrov, A.D.: A. D. Alexandrov Selected Works. Part II. Chapman & Hall/CRC, Boca Raton, FL, (2006). Intrinsic geometry of convex surfaces, Edited by S. S. Kutateladze, Translated from the Russian by S. Vakhrameyev
4. Ambrosio L., Tilli P.: Topics on Analysis in Metric Spaces, vol. 25 of Oxford Lecture Series in Mathematics and its Applications. Oxford University Press, Oxford (2004)
5. Burago D., Burago Y., Ivanov S.: A Course in Metric Geometry, vol. 33 of Graduate Studies in Mathematics. American Mathematical Society, Providence, RI (2001)