HRUSKA, A.J. An Interesting Concretion. Blue Jay, [S. l.], v. 35, n. 2, 1970. DOI: 10.29173/bluejay4026. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/4026. Acesso em: 1 may. 2024.