ISO 10303-11:1994 Industrial automation systems and integration - Product data representation and exchange - Part 11: Description methods: The EXPRESS language reference manual
2004ISO 10303-11:2004 Industrial automation systems and integration - Product data representation and exchange - Part 11: Description methods: The EXPRESS language reference manual
1999ISO 10303-11:1994/Cor 1:1999 Industrial automation systems and integration - Product data representation and exchange - Part 11: Description methods: The EXPRESS language reference manual; Technical Corrigendum 1
1994ISO 10303-11:1994 Industrial automation systems and integration - Product data representation and exchange - Part 11: Description methods: The EXPRESS language reference manual