@book{ international2011iaea, title={Certified Reference Materials for Radioactivity Measurements in Environmental Samples of Soil and Water}, author={ }, series={entity}, number={21 }, year={2011}, isbn={ }, url={/publications/8595/certified-reference-materials-for-radioactivity-measurements-in-environmental-samples-of-soil-and-water }, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY }, address={Vienna} }