Recovering initial condition backward problem for composite fractional relaxation equations. Letters on Applied and Pure Mathematics, [S. l.], v. 3, n. 1, p. 1–10, 2025. DOI: 10.66147/lapm.20253124. Disponível em: https://lapmjournal.com/index.php/lapm/article/view/lapm.20253124. Acesso em: 8 mar. 2026.