BEKKER, M. B.; BOHNER, M. J.; UGOLʹNIKOV, A. P.; VOULOV, H. D. Parametrization of scale-invariant self-adjoint extensions of scale-invariant symmetric operators. Methods of Functional Analysis and Topology, [S. l.], v. 24, n. 1, p. 1–15, 2018. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/679. Acesso em: 16 dec. 2025.