KIRAÇ, Alp Arslan. An Extension of The First Eigen-type Ambarzumyan theorem. Methods of Functional Analysis and Topology, [S. l.], v. 26, n. 2, p. 167–168, 2020. DOI: https://doi.org/10.31392/MFAT-npu26_2.2020.07. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/755. Acesso em: 15 dec. 2025.