Singh, Jagadish, and Tyokyaa K. Richard. “The Motion of a Test Particle Around the Out-of-Plane Libration Points in the ER3BP With Oblateness up to Zonal Harmonics J_4”. International Astronomy and Astrophysics Research Journal, vol. 2, no. 1, Oct. 2020, pp. 209-23, https://journaliaarj.com/index.php/IAARJ/article/view/28.