- Comparisons of the composition and biogeographic distribution of the bacterial communities occupying South African thermal springs with those inhabiting deep subsurface fracture water. Frontiers in Microbiology. 5.
- Nematoda from the terrestrial deep subsurface of South Africa. Nature. 474:79-82.
- South African crustal fracture fluids preserve paleometeoric water signatures for up to tens of millions of years. Chemical Geology. 493:379-395.