HERNGREEN, G.; LISSENBERG, T.; WHITE, L. Biostratigraphy of the Jurassic strata in the Dutch Central North Sea Graben. Danmarks Geologiske Undersøgelse Serie B, [S. l.], v. 16, p. 16–16, 1991. DOI: 10.34194/serieb.v16.7085. Disponível em: https://geusjournals.org/index.php/serieb/article/view/7085. Acesso em: 6 may. 2024.