“Suggested technique for Estimation preference grades proportion for several independent groups by using the Self - Consistent criteria in Factor Analysis” (2021) Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), 29(1), pp. 17–31. doi:10.55562/jrucs.v29i1.374.