1. Bartington (2019). https://www.bartington.com/wp-content/uploads/pdfs/datasheets/Grad-601_DS1800.pdf
2. Eastern Atlas (2019). http://www.eastern-atlas.com/start/index_eng.php
3. Ernenwein EG, Hargrave ML (2009) Archaeological geophysics for DoD field use: a guide for new and novice users report submitted to the environmental security technology certification program for project RC-200611: streamlined archaeo-geophysical data processing and integration for DoD field use. Center for Advanced Spatial Technologies, University of Arkansas, Fayetteville. https://wayback.archive-it.org/6471/20150825215604/http://cast.uark.edu/assets/files/PDF/ArchaeologicalGeophysicsforDoDFieldUse.pdf. Accessed 5 Mar 2014
4. Foerster (2019). https://www.fluxgate-magnetometer.com/de/produkte/ferex-4034/
5. GEMSystems (2019). http://www.gemsys.ca/advantages-of-magnetic-gradiometers/