PŁOCHOCKI, Z.; KAŹMIERCZAK, B.; PERADZYŃSKI, Z. The stationary Stokes flow through a spherical region with large variations of density and viscosity coefficient. Archives of Mechanics, Warsaw, Poland, v. 48, n. 4, p. 765–778, 1996. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v48p765. Acesso em: 19 nov. 2025.