WICANDER, R.; PLAYFORD, G. Organic-walled microphytoplankton assemblage of the Middle Devonian (Givetian) Arkona, Hungry Hollow and Widder formations, Ontario, Canada: biostratigraphic and palaeogeographic significance. Boletín Geológico y Minero, [S. l.], v. 128, n. 4, p. 839–883, 2017. DOI: 10.21701/bolgeomin.128.4.001. Disponível em: https://bgm.revistas.csic.es/index.php/bgm/article/view/220. Acesso em: 3 may. 2025.