Rimrott, F. P. J., and W. L. Cleghorn. “The Collinearity Principle and Minimum Energy Orbits”. Technische Mechanik - European Journal of Engineering Mechanics, vol. 20, no. 4, Oct. 2019, pp. 305-10, https://journals.ub.ovgu.de/index.php/techmech/article/view/1103.