NULL-CONTROLABILITY CRITERIA FOR NONLINEAR CONTROL SYSTEM. Nigerian Journal of Technology, [S. l.], v. 7, n. 1, p. 71–75, 2002. DOI: 10.4314/njt.71.375. Disponível em: https://nijotech.com/index.php/nijotech/article/view/375. Acesso em: 26 may. 2026.