Durham JW, Exline H, Regnéll G, Pawson DL, Wagner CD, Moore RC, et al. Part U, Echinodermata 3, vol. 1 & 2, Complete Volume. InvertebratePaleo [Internet]. 1966 Jan. 1 [cited 2024 May 6];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5659