FRYDA, Jan. Quasiorthogonal projective spaces. Annales Mathematicae Silesianae, [S. l.], v. 6, p. 84–93, 1992. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14269. Acesso em: 6 may. 2025.