VOROB'EV, I. V. Expansion of a Self-Adjoint Absolutely Continuous Singular Integral Operator in Generalized Eigenvectors and Its Diagonalization. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 1, p. 138–145, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3896. Acesso em: 6 dec. 2025.