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1. The Urban Redevelopment Authority (URA). Draft Master Plan 2019-Proposals for an Inclusive, Sustainable and Resilient City; Urban Redevelopment Authority: Singapore, 2019.？ 

2. Jaw, S.W.; Van Son, R.; Khoo, V.H.S.; Schrotter, G.; Loo, R.W.K.; Teo, S.S.N.; Yan, J. The Need for a Reliable Map of Utility Networks for Planning Underground Spaces. In Proceedings of the 2018 17th International Conference on Ground Penetrating Radar (GPR), Switzerland, 18-21 June 2018; pp. 1-6.？ 

3. Yan, J.; Jaw, S.W.; Son, R.V.; Soon, K.H.; Schrotter, G. Three-dimensional data modelling for underground utility network mapping. ISPRS Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci. 2018, XLII-4, 711-715.？ 

4. The British Standards Institution. PAS 128:2014 Specification for Underground Utility Detection, Verification and Location; BSI Standards Limited: UK, 2014.？ 

5. Becker, T.; Nagel, C.; Kolbe, T.H. Semantic 3D modeling of multi-utility networks in cities for analysis and 3D visualization. In Progress and New Trends in 3D Geoinformation Sciences; Germany, 2013; pp. 41-62.？ 

6. Groger, G.; Kolbe, T.H.; Nagel, C.; Hafele, K.H. OGC City Geography Markup Language (CityGML) Encoding Standard; Version 2.0, OGC doc no. 12-019; Open Geospatial Consortium: USA, 2012. Remote Sens. 2019, 11, 1957 21 of 21.？ 

7. Scholtenhuis, L.L.o.; Duijn, X.d.; Zlatanova, S. Representing geographical uncertainties of utility location data in 3D. Autom. Constr. 2018, 96, 483-493.？ 

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8. Liebich, T. IFC 2x Edition 3. In Model Implementation Guide, Version 2.0; buildingSMART International: Hertfordshire, UK, 2009.？ 

9. JRC. D2.8.III.6 INSPIRE Data Specification on Utility and Government Services-Technical Guidelines; European Commission Joint Research Centre: Brussels, Belgium, 2013.？ 

10. Lieberman, J.; Ryan, A. OGC Underground Infrastructure Concept Study Engineering Report; OGC Engineering Report; Open Geospatial Consortium: Wayland, MA, USA, 2017.？ 

11. International Standards Organization. ISO 19107:2003(en), Geographic information-Spatial Schema; ISO Copyright Office: Geneva, Switzerland, 2003.？ 

12. Singapore Land Authority. Standard and Specifications for Utility Survey in Singapore; Singapore Land Authority: Singapore, 2017.？ 

13. Jingya Yan, Siow Wei Jaw, Kean Huat Soon, Andreas Wieser, Gerhard Schrotter, Towards an Underground Utilities 3D Data Model for Land Administration, 2019.？ 

14. Gerhard Schrotter and Rob van Son, Digital Underground - Towards a Reliable Map of Subsurface Utilities in Singapore, 2020.