Pablo Ruales & Carlos Marin 2023. Light Deviation around a Spherical Rotating Black Hole to Fifth Order: Lindstedt-Poincar´e and Pad´e Approximations. New Frontiers in Physical Science Research Vol. 6. (Jan. 2023), 12–34. DOI:https://doi.org/10.9734/bpi/nfpsr/v6/3971B.