1.
Ekiel-Jeżewska M, Wajnryb E. Three-particle motion under gravity in Stokes flow: an equilibrium for spheres in contrast to "an end-of-world" for point particles. Arch. Mech. 2006;58(4-5):489-494. Accessed December 23, 2025. https://am.ippt.pan.pl/index.php/am/article/view/v58p489