A scientific study in the College of Science, Department of Mathematics, prepared by Assist. Professor Dr. Shatha Haddad and postgraduate student Duaa Dhumd, entitled (Onset of Double-Diffusive Convection with a Kelvin-Voigt Fluid of Variable Order), it was published in the journal (Special Topics & Reviews in Porous Media), which is classified in Clarivate by the Publisher (Begell House) and score score (2.3)