Alcántara Bode, J. (2009) «An example of two non-unitarily equivalent compact operators with the same traces and kernel», Pro Mathematica, 23(45-46), pp. 105–111. Disponible en: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10266 (Accedido: 11 diciembre 2025).