Emmanuel, Eziokwu C. “On Application of Unbounded Hilbert Linear Operators in Quantum Mechanics: On Application of Unbounded Hilbert Linear Operators in Quantum Mechanics”. Asian Journal of Mathematical Sciences(AJMS) 4, no. 3 (November 18, 2020). Accessed July 1, 2025. http://ajms.in/index.php/ajms/article/view/283.