1. ANL. 1993. Data collection handbook to support modeling the impacts of radioactive material in soil, environmental assessment and information sciences division. ANL/EAIS-8, Argonne, IL: Argonne National Laboratory, April.
2. Ashoka Machines. 2019. Process equipment storage silos manufacturers – STORAGE SILOS. Accessed May 13, 2019. https://www.ashokamachines.com/project-details/process-equipment-storage-silos-manufacturers/.
3. CRCPD. 2004. Regulation and licensing of technologically enhanced naturally occurring radioactive material (TENORM). SSRCR Part N. Conference of Radiation Control Program Directors, Frankfort, Kentucky.
4. CRCPD. 2015. E-42 task force report: review of TENORM in the oil & gas industry. Conference of Radiation Control Program Directors, Publication no. CRCPD E-15-2, June 2015.