Comment on “Central potentials on spaces of constant curvature: The Kepler problem on the two-dimensional sphere S2 and the hyperbolic plane H2” [J. Math. Phys. 46, 052702 (2005)

Abstract

Cariñena, Rañada, and Santander consider a classical Kepler problem in constant curvature spaces and related theory of conics in these spaces. Here we point out that earlier results exist in the literature. Some of these results date back to the nineteenth and the beginning of the twentieth century.