GRAHN, Y.; NØHR-HANSEN, H. Chitinozoans from Ordovician and Silurian shelf and slope sequences in North Greenland. Rapport Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 144, p. 35–41, 1989. DOI: 10.34194/rapggu.v144.8060. Disponível em: https://geusjournals.org/index.php/rapggu/article/view/8060. Acesso em: 18 may. 2024.