O’CONNOR, B. The Portfjeld Formation (?Early Cambrian) of eastern North Greenland. Rapport Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 88, p. 23–28, 1979. DOI: 10.34194/rapggu.v88.7552. Disponível em: https://geusjournals.org/index.php/rapggu/article/view/7552. Acesso em: 3 jul. 2024.