van Heerden, E., D.J. Opperman, A.P. Bester, J. Van Marwijk, E.D. Cason, D. Litthauer, L.A. Piater, and T.C. Onstott. 2008. “Metabolic Promiscuity from the Deep Subsurface: A Story of Survival or Superiority”. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7097. doi:10.1117/12.801142.

Borgonie, G., B. Linage-Alvarez, A.O. Ojo, S.O.C. Mundle, L.B. Freese, C. Van Rooyen, O. Kuloyo, et al. 2015. “Eukaryotic Opportunists Dominate the Deep-Subsurface Biosphere in South Africa”. Nature Communications 6. doi:10.1038/ncomms9952.

Borgonie, G., B. Linage-Alvarez, A. Ojo, S. Shivambu, O. Kuloyo, E.D. Cason, S. Maphanga, et al. 2015. “Deep Subsurface Mine Stalactites Trap Endemic Fis Sure Fluid Archaea, Bacteria and Nematoda Possibly Originating from Ancient Seas”. Frontiers in Microbiology 6. doi:10.3389/fmicb.2015.00833.

Borgonie, G., C. Magnabosco, A. García-Moyano, B. Linage-Alvarez, A.O. Ojo, L.B. Freese, C. Van Jaarsveld, et al. 2019. “New Ecosystems in the Deep Subsurface Follow the Flow of Water Driven by Geological Activity”. Scientific Reports 9. doi:10.1038/s41598-019-39699-w.

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.