ZHAO, G. The Principal Eigenvalue Problems for Perturbed Fractional Laplace Operators. Tamkang Journal of Mathematics, [S. l.], v. 52, n. 2, p. 189-220, 2021. DOI: 10.5556/j.tkjm.52.2021.3209. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3209. Acesso em: 24 jun. 2021.