Lollar, Sherwood, E. van Heerden, T.C. Onstott, and T. Kieft. 2011. “Carbon Cycling in the Deep Crustal Biosphere”. Elements 7: 137. Referenced from www.scopus.com: Carbon cycling in the deep crustal biosphere. Reference Link
Heard, A.W., O. Warr, G. Borgonie, B. Linage, O. Kuloyo, J.W. Fellowes, C. Magnabosco, et al. 2018. “South African Crustal Fracture Fluids Preserve Paleometeoric Water Signatures for up to Tens of Millions of Years”. Chemical Geology 493: 379-95. doi:10.1016/j.chemgeo.2018.06.011. Reference Link