JURGAITIS, Donatas; JANAVIČIUS, Arvydas-Juozapgs. Reduction of system of partial derivatives with nilpotent matrix. Lietuvos matematikos rinkinys, [S. l.], v. 40, n. spec., p. 132–135, 2000. DOI: 10.15388/LMR.2000.35077. Disponível em: https://journals.vu.lt./LMR/article/view/35077. Acesso em: 26 apr. 2025.