Webster, Roger. “On the Bohr-Mollerup-Artin Characterization of the Gamma Function”. Rev. Anal. Numér. Théor. Approx. 26, no. 1 (August 1, 1997): 249–258. Accessed December 4, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1997-vol26-nos1-2-art33.