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+@article{Ledoux19,
+  author = {Hugo Ledoux and Ken Arroyo Ohori and Kavisha Kumar and Bal{\'{a}}zs Dukai and Anna Labetski and Stelios Vitalis},
+  doi = {http://dx.doi.org/10.1186/s40965-019-0064-0},
+  journal = {Open Geospatial Data, Software and Standards},
+  number = {4},
+  title = {{CityJSON}: a compact and easy-to-use encoding of the {CityGML} data model},
+  volume = {4},
+  year = {2019}
+}