“Transform the Multivariate to Unitevariate System and Using Elimination and Duplication Matrices With Some Applications”. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 30, no. 2 (October 19, 2021): 35–47. Accessed November 19, 2024. https://alhadhar.com/raf-journal/index.php/JAUCS/article/view/364.