“Estimating Restricted Gamma Regression Model by Combining Gamma Ridge Regression and Restricted Maximum Likelihood With Presence of the Multicollinearity Problem With Application”. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), vol. 56, no. 1, Jan. 2025, pp. 265-73, https://doi.org/10.55562/jrucs.v56i1.24.