On the regularity of certain three-row almost Hermitian incidence matrices. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 107, p. 131–137, 2020. DOI: 10.60063/gsu.fmi.107.131-137. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/108. Acesso em: 16 dec. 2025.