2022. Cascade System Reliability for Weibull - Fréchet Distribution. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 50, 3 (Jan. 2022), 199–211. DOI:https://doi.org/10.55562/jrucs.v50i3.514.