FAVINI, A. Direct and inverse problems for linear relations. Bruno Pini Mathematical Analysis Seminar, [S. l.], v. 4, n. 1, p. 1–14, 2013. DOI: 10.6092/issn.2240-2829/4157. Disponível em: https://mathematicalanalysis.unibo.it/article/view/4157. Acesso em: 2 may. 2024.