Impacts of Activation Energy and Modified Darcy Law on the Motion of Williamson Nanofluid over a Stretching Riga Sheet through Porous Medium. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 18, n. 1, p. 5616, 2025. DOI: 10.29020/nybg.ejpam.v18i1.5616. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/5616. Acesso em: 5 dec. 2025.