1. Open Geospatial Consortium, Gazetteer Service,2006
2. ISO 19112:2003, Geographic information – Spatial referencing by geographic identifiers;International Organization for Standardization,2003
3. ISO 19128:2005, Geographic information – Web Map Service Interface;International Organization for Standardization,2005
4. Open Geospatial Consortium,2006
5. INSPIRE Thematic Working Group Addresses,2010