BOHNER, M. J.; BEKKER, M. B.; NUDEL'MAN M. A.; VOULOV, H. D. Scale-invariant self-adjoint extensions of scale-invariant symmetric operators: continuous versus discrete. Methods of Functional Analysis and Topology, [S. l.], v. 21, n. 1, p. 41–55, 2015. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/599. Acesso em: 16 dec. 2025.