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Doerr, S.H. (18. mars 1999): "Karst-like landforms and hydrology in quartzites of the Venezuelan Guyana shield: Pseudokarst or "real" karst?". Zeitschrift für Geomorphologie. 43 (1): 1–17. Bibcode:1999ZGm....43....1D. doi:10.1127/zfg/43/1999/1.
Billi, Andrea; De Filippis, Luigi; Poncia, Pier Paolo; et al. (Februar 2016): «Hidden sinkholes and karst cavities in the travertine plateau of a highly-populated geothermal seismic territory (Tivoli, central Italy)», Geomorphology. 255: 63–80. Bibcode:2016Geomo.255...63B. doi:10.1016/j.geomorph.2015.12.011.