1. B. B. Polynov, “The first stages of soil formation on massive crystalline rocks,” Pochvovedenie, No. 7, 327–339 (1945).
2. M. A. Glazovskaya, “Influence of microorganisms on the processes of weathering of primary minerals,” Izv. Akad. Nauk Kazakh. SSR, Ser. Pochvovedenie, No. 6, 79–100 (1950).
3. Biological Soil Crusts: An Organizing Principle in Drylands, Ed. by B. Weber, B. Büdel, and J. Belnap (Springer International, 2016), pp. 3–13.
4. B. B. Polynov, Weathering Crust (Izd. Akad. Nauk SSSR, Leningrad, 1934) [in Russian].
5. N. Mergelov, C. W. Mueller, I. Prater, et al., “Alteration of rocks by endolithic organisms is one of the pathways for the beginning of soils on Earth,” Sci. Rep. 8, 1–15 (2018).