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digitalenergyjournal.com
Blue D, Meskauskas A (2009). Using low frequency seismic. Digital Energy Journal"Digital Energy Journal". Archived from the original on 2009-06-28. Retrieved 2009-06-02..
Walker D (2008). Recent developments in low frequency spectral analysis of passive seismic data. First break, 26, 69-77 "Archived copy"(PDF). Archived from the original(PDF) on 2010-08-21. Retrieved 2009-03-11.{{cite web}}: CS1 maint: archived copy as title (link)
Walker D (2008). Recent developments in low frequency spectral analysis of passive seismic data. First break, 26, 69-77 "Archived copy"(PDF). Archived from the original(PDF) on 2010-08-21. Retrieved 2009-03-11.{{cite web}}: CS1 maint: archived copy as title (link)
Blue D, Meskauskas A (2009). Using low frequency seismic. Digital Energy Journal"Digital Energy Journal". Archived from the original on 2009-06-28. Retrieved 2009-06-02..