1. ISO (1993) ISO standards handbook. ISO 31 series, 3rd edn. ISO, Geneva, pp 1–345
2. IUPAC, Physical Chemistry Division (1988) Quantities, units and symbols in physical chemistry. (The Green Book) 1st edn. Blackwell Scientific Publications ix + 135, Oxford. [Prepared for publication by Mills I, Cvitaš T, Homann K, Kallay N, Kuchitsu K]
3. IUPAC, Physical Chemistry Division (1993) Quantities, units and symbols in physical chemistry. (The Green Book) 2nd edn. Blackwell Scientific Publications. ix + 167, Oxford. [Prepared for publication by Mills I, Cvitaš T, Homann K, Kallay N, Kuchitsu K] (The 3rd edn. expected in print 2007.)
4. Rigg JC, Brown SS, Dybkær R, Olesen H (1995) IUPAC, IFCC Compendium of terminology and nomenclature of properties in clinical laboratory sciences, Recommendations 1995 (The Silver Book). Blackwell Science Ltd xi + 290, Oxford
5. Dybkaer R (2004) An ontology for physical, chemical, and biological systems. Thesis APMIS (Acta Path Microbiol Immunol Scand) 122(Suppl 117):1–210