Myronyuk, M. V. “On the Skitovich-Darmois Theorem and Heyde Theorem in a Banach Space”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 9 (September 25, 2008): 1234–1242. Accessed March 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3239.