Stanley, G. D.; Stürmer, W. (9 June 1983). "The first fossil ctenophore from the Lower Devonian of West Germany". Nature. 303 (5917): 518–520. Bibcode:1983Natur.303..518S. doi:10.1038/303518a0.
Stanley, G. D.; Stürmer, W. (9 June 1983). "The first fossil ctenophore from the Lower Devonian of West Germany". Nature. 303 (5917): 518–520. Bibcode:1983Natur.303..518S. doi:10.1038/303518a0.