MODEL REPRESENTATIONS OF THE LIE ALGEBRA $[A_2, A_1] = iA_1$ OF LINEAR NON-SELFADJOINT OPERATORS. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 100, p. 93–112, 2011. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/248. Acesso em: 14 dec. 2025.