KIRJACKIS, Eduardas; KIRJACKIS, Jevgenijus. On some properties of the linear-invariant family of n-th order. Lietuvos matematikos rinkinys, [S. l.], v. 46, n. spec., p. 48–52, 2023. DOI: 10.15388/LMR.2006.30571. Disponível em: https://www.journals.vu.lt/LMR/article/view/30571.. Acesso em: 17 may. 2024.