SINHA, Nirbhay Kumar. First order normalization in the generalized photo gravitational non-planar restricted three body problems. International Journal of Advanced Astronomy, [S. l.], v. 3, n. 2, p. 46–52, 2015. DOI: 10.14419/ijaa.v3i2.4652. Disponível em: https://sciencepubco.com/index.php/IJAA/article/view/4652.. Acesso em: 27 apr. 2024.