MA, B. Lower order eigenvalues of the Schrodinger operator. Communications in Mathematics and Applications, [S. l.], v. 5, n. 2, p. 47–52, 2014. DOI: 10.26713/cma.v5i2.176. Disponível em: https://www.rgnpublications.com/journals/index.php/cma/article/view/176. Acesso em: 2 may. 2024.