1.
Ubaghs G, Caster KE. Part S, Echinodermata 1, vol. 1 & 2 , Ch. 4, p. 455 - 565. InvertebratePaleo [Internet]. 1968 Jan. 1 [cited 2024 Nov. 3];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5637