1. GENIE, 2000. Spectroscopy software – LabSOCS calibration software. Canberra Industries, US.
2. Procedures for detecting outlying observations in samples;Grubbs;Technometrics,1969
3. IAEA, 2010. Worldwide open proficiency test: determination of naturally occurring radionuclides in phosphogypsum and water. IAEA Analytical Quality in Nuclear Applications Series no. 18. Vienna, Austria
4. ISO Guide 35:2006(E), Reference Materials-general and Statistical Principles for Certification;ISO,2006
5. ISO/IEC 17043:2010(E), Conformity Assessment-general Requirements for Proficiency Testing;ISO,2010