Pablo Ruales and Carlos Marin. Light Deviation around a Spherical Rotating Black Hole to Fifth Order: Lindstedt-Poincar´e and Pad´e Approximations. NFPSR-V6 [Internet]. 2023 Jan. 14 [cited 2026 Jun. 3];:12-34. Available from: https://stm.bookpi.org/NFPSR-V6/article/view/9208