R. Ishimura and X. Jin, “Infinite order differential equations in the space of entire functions of normal type with respect to a proximate order”, NWEJM, no. 5, pp. 69–86, Jun. 2019, Accessed: Oct. 18, 2024. [Online]. Available: https://nwejm.univ-lille.fr/index.php/nwejm/article/view/38