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Grab, Stefan W.; Gatebe, Charles K.; Kinyua, Antony M. Ground Thermal Profiles from Mount Kenya, East Africa. Geografiska Annaler: Series A, Physical Geography. 2004, 86 (2): 131–141. ISSN 0435-3676. JSTOR 3566103. doi:10.1111/j.0435-3676.2004.00219.x.
Hallet, Bernard. Stone circles: form and soil kinematics. Phil. Trans. R. Soc. Lond. A. 2013, 371 (2004): 20120357. PMID 24191111. doi:10.1098/rsta.2012.0357.
Grab, Stefan W.; Gatebe, Charles K.; Kinyua, Antony M. Ground Thermal Profiles from Mount Kenya, East Africa. Geografiska Annaler: Series A, Physical Geography. 2004, 86 (2): 131–141. ISSN 0435-3676. JSTOR 3566103. doi:10.1111/j.0435-3676.2004.00219.x.