Esferas de Dandelin (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Esferas de Dandelin" in Spanish language version.

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Taylor, Charles. An Introduction to the Ancient and Modern Geometry of Conics, page 196 ("focal spheres"), pages 204-205 (history of discovery) (Deighton, Bell and co., 1881).
Kendig, Keith. Conics, page 86 (proof for ellipse) and page 141 (for hyperbola) (Cambridge University Press, 2005).
Heath, Thomas. A History of Greek Mathematics, page 119 (focus-directrix property), page 542 (sum of distances to foci property) (Clarendon Press, 1921).
Brannan, A. et al. Geometry, page 19 (Cambridge University Press, 1999).
Morton, Pierce. Geometry, Plane, Solid, and Spherical, in Six Books, page 228 (Baldwin and Cradock, 1830).

Hyman, Andrew. "A Simple Cartesian Treatment of Planetary Motion", European Journal of Physics, Vol. 14, page 145 (1993).