1.
Moore RC, Fell HB, Ubaghs G. Part S, Echinodermata 1, vol. 1 & 2 , Ch. 1, p. 1 - 85. InvertebratePaleo [Internet]. 1968 Jan. 1 [cited 2024 Nov. 21];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5634