BERGER, T.; SNOO, H.; TRUNK, C.; WINKLER, H. Linear relations and their singular chains. Methods of Functional Analysis and Topology, [S. l.], v. 27, n. 4, p. 287–301, 2021. DOI: https://doi.org/10.31392/MFAT-npu26_4.2021.01. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/803. Acesso em: 15 dec. 2025.