“On The Identity d(x) = λx + ζ(x)”. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 32, no. 2 (October 17, 2021): 265–282. Accessed September 2, 2026. https://jrucs.iq/index.php/JAUCS/article/view/340.