*'''4th Joint SIG 3D and OGC Workshop on the CityGML UtilityNetwork ADE and 1st joint workshop on the CityGML Energy ADE and CityGML UtilityNetwork ADE – Karlsruhe, December 6-8, 2017''' | *'''4th Joint SIG 3D and OGC Workshop on the CityGML UtilityNetwork ADE and 1st joint workshop on the CityGML Energy ADE and CityGML UtilityNetwork ADE – Karlsruhe, December 6-8, 2017''' |