Estimating the number of limit cycles for one step perturbed homogeneous degenerate centers. Extracta Mathematicae, [S. l.], v. 38, n. 1, p. 85–104, 2023. DOI: 10.17398/2605-5686.38.1.85. Disponível em: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.38.1.85.. Acesso em: 18 apr. 2024.