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3. Stray Currents in Transit Systems, www.corrosion-doctors.org/StrayCurrent/Transit-Systems.htm [as posted on 07.21.06].
4. Robles Hernandez, FC, Koch K, Plascencia Barrera G, Rail base corrosion detection and prevention TCRP web document http://onlinepubs.trb.org/onlinepubs/tcrp/tcrp_webdoc_37.pdf, 2007.
5. Robles Hernández FC, Koch K, Rail base corrosion analysis: a major factor that shortens the service life of rail in North American transit systems. 136 TMS Annual Meeting and Exhibition, Orlando, FL; 2007.