- Manuel F. Rañada, Mariano Santander, “On harmonic oscillators on the two-dimensional sphere S2 and the hyperbolic plane H2”, Journal of Mathematical Physics, 43, no. 1, 2002, 431
- Maciej Błaszak, Krzysztof Marciniak, “On Reciprocal Equivalence of Stäckel Systems”, Stud Appl Math, 129, no. 1, 2012, 26
- Andrey V. Tsiganov, “The Kepler Problem: Polynomial Algebra of Nonpolynomial First Integrals”, Regul. Chaot. Dyn., 24, no. 4, 2019, 353