PEEL, J. Spirellus and related helically coiled microfossils (cyanobacteria) from the Lower Cambrian of North Greenland. Rapport Grønlands Geologiske Undersøgelse, Copenhagen, Denmark, v. 137, p. 5–32, 1988. DOI: 10.34194/rapggu.v137.8009. Disponível em: https://geusjournals.org/index.php/rapggu/article/view/8009. Acesso em: 17 may. 2024.