ALLERGRETTO, W.; NISTRI, P. Periodic solutions and optimization problems for a class of semilinear parabolic control systems. Topological Methods in Nonlinear Analysis, [S. l.], v. 5, n. 2, p. 345–356, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.024. Acesso em: 22 jul. 2024.