Desigualdad de Ptolomeo (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Desigualdad de Ptolomeo" in Spanish language version.

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Steele, J. Michael (2004), «Exercise 4.6 (Ptolemy's Inequality)», The Cauchy-Schwarz Master Class: An Introduction to the Art of Mathematical Inequalities, MAA problem books, Cambridge University Press, p. 69, ISBN 9780521546775 ..
Alsina, Claudi; Nelsen, Roger B. (2009), «6.1 Ptolemy's inequality», When Less is More: Visualizing Basic Inequalities, Dolciani Mathematical Expositions 36, Mathematical Association of America, pp. 82-83, ISBN 9780883853429 ..
Stankova, Zvezdelina; Rike, Tom, eds. (2008), «Problem 7 (Ptolemy's Inequality)», A Decade of the Berkeley Math Circle: The American Experience, MSRI Mathematical Circles Library 1, American Mathematical Society, p. 18, ISBN 9780821846834 ..
Silvester, John R. (2001), «Proposition 9.10 (Ptolemy's theorem)», Geometry: Ancient and Modern, Oxford University Press, p. 229, ISBN 9780198508250 ..
Giles, J. R. (2000), «Exercise 12», Introduction to the Analysis of Normed Linear Spaces, Australian Mathematical Society lecture series 13, Cambridge University Press, p. 47, ISBN 9780521653756 ..

Schoenberg, I. J. (1940), «On metric arcs of vanishing Menger curvature», Annals of Mathematics, Second Series 41: 715-726, doi:10.2307/1968849 .
Schoenberg, I. J. (1952), «A remark on M. M. Day's characterization of inner-product spaces and a conjecture of L. M. Blumenthal», Proceedings of the American Mathematical Society 3: 961-964, doi:10.2307/2031742 ..
Howorka, Edward (1981), «A characterization of Ptolemaic graphs», Journal of Graph Theory 5 (3): 323-331, doi:10.1002/jgt.3190050314 ..
Buckley, S. M.; Falk, K.; Wraith, D. J. (2009), «Ptolemaic spaces and CAT(0)», Glasgow Mathematical Journal 51 (2): 301-314, doi:10.1017/S0017089509004984 ..