1. ISO, 1993. Guide to the Expression of Uncertainty in Measurement. International Organisation for Standardisation (ISO), Geneva, Switzerland.
2. ISO, 2003. Injection containers and accessories–Part 1: injection vials made of glass tubing. International Organisation for Standardisation (ISO), Geneva, Switzerland. ISO8362-1:2003(E).
3. NPL-CRC Radionuclide Calibrator, Southern Scientific Ltd., Scientific House, Rectory Farm Road, Sompting, Lancing, West Sussex, BN15 0DP, United Kingdom. (previously marketed by Vinten Instruments Ltd. and NE Technology Ltd. as the 671 or ISOCAL IV).
4. Nycomed Amersham, 2000a. Packing note: Improved Presentation for Tl-201 Chloride (TDS1P).
5. Nycomed Amersham, 2000b. Private communication, Amersham Healthcare, United Kingdom.