1. International Standard ISO 4037-1:1996, ISO 4037-2:1997, ISO 4037-3:1999 „X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy”
2. Calibration and Measurement Capabilities – Ionizing Radiation. Complete CMCs in Ionizing Radiation for Germany. The BIPM key comparison database, February 2013 http://kcdb.bipm.org/AppendixC/country_list_search_RI.asp?CountSelected=PTB;10;-;6;-&branch=1&quantity=10&source=6&country_sel=DE accessed on April 23, 2014)
3. Calibration and Measurement Capabilities – Ionizing Radiation. Complete CMCs in Ionizing Radiation for Russian Federation. The BIPM key comparison database, July 2004 (http://kcdb.bipm.org/AppendixC/country_list_search_RI.asp?CountSelected=VNIIM;8;-;6;-&branch=1&quantity=8&source=6 accessed on April 23, 2014)
4. New LNHB primary standard for60Co air kerma
5. ICRU Report No. 57 „Conversion Coefficients for use in Radiological Protection against External Radiation” (1998)