OLIVER, W. A. J.; SORAUF, J. E. Heliophyllum Hall and Charisphyllum n. gen. (Devonian rugose corals) of the Cantabrian Mountains (NW Spain). Trabajos de Geología, [S. l.], v. 17, n. 17, p. 3–19, 1988. DOI: 10.17811/tdg.17.1988.3-19. Disponível em: https://reunido.uniovi.es/index.php/TDG/article/view/2835. Acesso em: 28 mar. 2024.