1.
Peel J. Spirellus and related helically coiled microfossils (cyanobacteria) from the Lower Cambrian of North Greenland. rapggu [Internet]. 1988 Dec. 31 [cited 2024 Nov. 27];137:5-32. Available from: https://geusjournals.org/index.php/rapggu/article/view/8009