Alcántara Bode, Julio. An Example of Two Non-Unitarily Equivalent Compact Operators With the Same Traces and Kernel. Pro Mathematica 23, no. 45-46 (septiembre 7, 2009): 105-111. Accedido abril 12, 2024. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10266.