Álvarez-Vázquez, C. and Wagner, R.H. 2017. A revision of Annularia and Asterophyllites species from the lower Westphalian (Middle Pennsylvanian) of the Maritime Provinces of Canada. Atlantic Geoscience. 53, (Mar. 2017), 017–062. DOI:https://doi.org/10.4138/atlgeol.2017.002.