HASSI, S.; LABROUSSE, J. Ph.; DE SNOO, H. Selfadjoint extensions of relations whose domain and range are orthogonal. Methods of Functional Analysis and Topology, [S. l.], v. 26, n. 1, p. 39–62, 2020. DOI: https://doi.org/10.31392/MFAT-npu26_1.2020.03. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/743. Acesso em: 16 dec. 2025.