ISMAIL, A.I. Treating a singular case for a motion of rigid body in a Newtonian field of force. Archives of Mechanics, Warsaw, Poland, v. 49, n. 6, p. 1091–1101, 1997. Disponível em: http://am.ippt.gov.pl/index.php/am/article/view/v49p1091. Acesso em: 17 jan. 2026.