Chivian, D., E.L. Brodie, E.J. Alm, D.E. Culley, P.S. Dehal, T.Z. DeSantis, T.M. Gihring, et al. 2008. “Environmental Genomics Reveals a Single-Species Ecosystem Deep Within Earth”. Science 322: 275-78. doi:10.1126/science.1155495.

Liang, R., M.C.Y. Lau, O. Baars, F.T. Robb, and T.C. Onstott. 2019. “Aspartic Acid Racemization Constrains Long-Term Viability and Longevity of Endospores”. FEMS Microbiology Ecology 95. doi:10.1093/femsec/fiz132.