FAVINI, A. Perturbative methods for inverse problems on degenerate differential equations. Bruno Pini Mathematical Analysis Seminar, [S. l.], v. 3, n. 1, p. 88–103, 2012. DOI: 10.6092/issn.2240-2829/3422. Disponível em: https://mathematicalanalysis.unibo.it/article/view/3422. Acesso em: 3 may. 2024.