2019DB37/T 1997.4-2019 Property Service Specification Part 4: University Property
2011DB37/T 1997.3-2011 Property Service Specification Part 3 University Property
DB37/T 1997.4-2019 Property Service Specification Part 4: University Property has been changed from DB37/T 1997.3-2011 Property Service Specification Part 3 University Property.