A. G.Bakan, and GolubA. P. “Certain Negative Results on Consequences of the First Kind Multipliers”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 3 (April 2, 1992): 305-309. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8098.