BOUCOT, A.; HURST, J. Silurian biostratigraphy: revision of the North Atlantic Realm in the Llandovery. Rapport Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 91, p. 57–60, 1979. DOI: 10.34194/rapggu.v91.7620. Disponível em: https://geusjournals.org/index.php/rapggu/article/view/7620. Acesso em: 3 jul. 2024.