H. Neciosup Puican, “Aplicaciones del teorema de Brauer al problema espectral inverso no negativo”, ProMath, vol. 25, no. 49, pp. 11–40, Jun. 2011, Accessed: Oct. 24, 2026. Available: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/2655