- Capture of Planktonic Microbial Diversity in Fractures by Long-Term Monitoring of Flowing Boreholes, Evander Basin, South Africa. Geomicrobiology Journal. 28:275-300.
- Predominance of Anaerobic, Spore-Forming Bacteria in Metabolically Active Microbial Communities from Ancient Siberian Permafrost. Applied and Environmental Microbiology. 85.
- Trends and future challenges in sampling the deep terrestrial biosphere. Frontiers in Microbiology. 5.