CONTROL OF SINGULAR DISTRIBUTED SYSTEMS BY CONTROLLABILITY: THE ILL-POSED BACKWARDS HEAT EQUATION. Far East Journal of Applied Mathematics, [S. l.], v. 118, n. 1, p. 69–94, 2025. DOI: 10.17654/0972096025005. Disponível em: https://pphmjopenaccess.com/fejam/article/view/3167. Acesso em: 5 jan. 2026.