Bacaan lanjut Orbit_eliptik

  • D’Eliseo, MM (2007). "The first-order orbital equation". American Journal of Physics. 75: 352–355. doi:10.1119/1.2432126
  • D’Eliseo, MM (2009). "The gravitational ellipse". Journal of Mathematical Physics. 50: 022901–022901–10 doi = 10.1063/1.3078419. Selenggaraan CS1: Paip hilang (link)