LAURSEN, D. Cyrtograptusskifrene paa Bornholm. 2. Læsaa. Danmarks Geologiske Undersøgelse II. Række, [S. l.], v. 70, p. 1–19, 1943. DOI: 10.34194/raekke2.v70.6859. Disponível em: https://geusjournals.org/index.php/raekke2/article/view/6859. Acesso em: 17 may. 2024.