FERNÁNDEZ, Jorge Eduardo. Die Weltalter, tests of a time system. Characteristica Universalis Journal, [S. l.], v. 1, n. 1, p. 52–67, 2020. DOI: 10.5281/zenodo.4294129. Disponível em: https://cujournal.com.ar/index.php/home/article/view/4. Acesso em: 14 apr. 2024.