Schopf, J. W., Kitajima, K., Spicuzza, M. J., Kudryavtsev, A. B., & Valley, J. W. (2018). SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions. Proc Natl Acad Sci U S A.

Schopf, J. William, Kouki Kitajima, Michael J. Spicuzza, Anatoliy B. Kudryavtsev, và John W. Valley. "SIMS Analyses of the Oldest Known Assemblage of Microfossils Document Their Taxon-correlated Carbon Isotope Compositions." Proc Natl Acad Sci U S A 2018.

Schopf, J. William, et al. "SIMS Analyses of the Oldest Known Assemblage of Microfossils Document Their Taxon-correlated Carbon Isotope Compositions." Proc Natl Acad Sci U S A 2018.