[1]
B. D. Webby, C. W. Stearn, and H. Nestor, “Treatise Online, no. 32: Part E, Revised, Volume 4, Chapter 12: Biostratigraphy of the Paleozoic Stromatoporoidea”, TREON, Feb. 2012, doi: 10.17161/to.v0i0.4254.