Duggal, B. P. “Functional Equations and Linear Transformations I (Solvability on L<sub>p</Sub> Spaces)”. The Journal of the Indian Mathematical Society 38, no. 1-4 (December 1, 1974): 71–97. Accessed July 18, 2024. https://informaticsjournals.com/index.php/jims/article/view/16683.