SKRYPNIK, W. I. BBGKY hierarchy and its evolution operator for one class of integrable systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 6, p. 853–858, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5478. Acesso em: 17 feb. 2026.