FRYKMAN, P. Ordovician chitinous hydroids from Peary Land, eastern North Greenland. Rapport Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 91, p. 25–27, 1979. DOI: 10.34194/rapggu.v91.7617. Disponível em: https://geusjournals.org/index.php/rapggu/article/view/7617. Acesso em: 3 jul. 2024.