Thomazo, C., E. Couradeau, A. Giraldo-Silva, J. Marin-Carbonne, A. Brayard, M. Homann, P. Sansjofre, S. V. Lalonde and F. Garcia-Pichel. 2020. Biological soil crusts as modern analogues for the Archean Continental Biosphere: Insights from carbon and nitrogen isotopes. Astrobiology 20(7):815–819.