PARASYUK, I. O.; SAMOILENKO, A. M. On the integral of a function along the trajectories of a nilpotent flow. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 6, p. 837–847, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5476. Acesso em: 6 dec. 2025.