1. ASTM D2216 – 10, Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass, [Online]. Available: https://www.astm.org/Standards/D2216.htm (Accessed January 2018).
2. Analysis of Ground Level Enhancements: Extreme Solar Energetic Particle Events Have Hard Spectra;Asvestari,2016
3. Data from McMurdo, Swarthmore/Newark, South Pole, and Thule;Bartol Research Institute Neutron Monitor Data,2012
4. Bridgeport usbBase – Plug-on MCA with HV. [Online]. Available: http://www.bridgeportinstruments.com/products/usb_base/usbbase_flyer_u6.pdf (Accessed November 2017).