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Graf, T.; Simmons, C. T. (February 2009). "Variable-density groundwater flow and solute transport in fractured rock: Applicability of the Tang et al. [1981] analytical solution". Water Resources Research. 45 (2): W02425. Bibcode:2009WRR....45.2425G. doi:10.1029/2008WR007278. S2CID133884299.
Graf, T.; Simmons, C. T. (February 2009). "Variable-density groundwater flow and solute transport in fractured rock: Applicability of the Tang et al. [1981] analytical solution". Water Resources Research. 45 (2): W02425. Bibcode:2009WRR....45.2425G. doi:10.1029/2008WR007278. S2CID133884299.
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"Eawag aquatic research". Swiss Federal Institute of Aquatic Science and Technology. 25 January 2012. Archived from the original on 25 June 2015. Retrieved 8 March 2013.