Morais, L.; Fairchild, T. R.; Lahr, D. J.; Rudnitzki, I. D.; Schopf, J. W.; Garcia, A. K.; Kudryavtsev, A. B.; Romero, G. R. (2017). Carbonaceous and siliceous Neoproterozoic vase-shaped microfossils (Urucum Formation, Brazil) and the question of early protistan biomineralization. Journal of Paleontology. 91(3): 393-406.