1. Characterisation of Devonian Ohio Shale SDO-1 as a USGS geochemical reference sample;Kane;Geostandards Newsletter,1990
2. 1988 compilation of elemental concentration data for USGS DTS-1, G-1, PCC-1 and W-1;Gladney;Geostandards Newsletter,1991
3. Terms and definitions used in connection with reference materials;ISO 30;International Organisation for Standardisation (ISO), Guide,1978
4. The role of standard reference materials in measurement systems;Cali;U.S. Department of Commerce, NBS Monograph,1975