1. The Practical Salinity Scale 1978 and the International Equation of State of Seawater 1980, Technical Papers in Marine Science, No. 36, UNESCO, Paris, 1981
2. Terms and Definitions Used in Connection with Reference Materials. ISO Guide 30. International Organization for Standardization, Geneva, 1992
3. Ph. Quevauviller and E. M.Maier, Production of CRMs for Environmental Matrices, Report No. EUR 18157EN of the European Commission, ed. Kramer, K. J. M., EC-SM&T Programme, European Commission, Brussels, 1998
4. F. A. J. M. Vijverberg and W. P.Cofino, Control Procedures: Good Laboratory Practice and Quality Assurance, ICES Techniques in Marine Environmental Sciences, No. 6, ICES, Copenhagen, 1987
5. Reference Methods and Materials: a Programme of Support for Regional and Global Marine Pollution Assessments, in UNEP/IAEA/IOC Report, UNEP, Nairobi, 1990