BESPALOV, Yu. Algebraic operators, partial isometries, and wild problems. Methods of Functional Analysis and Topology, [S. l.], v. 3, n. 1, p. 28–45, 1997. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/28. Acesso em: 19 dec. 2025.