@article{202007.0556,
	doi = {10.20944/preprints202007.0556.v1},
	url = {https://doi.org/10.20944/preprints202007.0556.v1},
	year = 2020,
	month = {July},
	publisher = {Preprints},
	author = {Jianming Liang and Jianhua Gong and Xiuping Xie and Jun Sun},
	title = {Solar3D: A 3D Extension of GRASS GIS r.sun for Estimating Solar Radiation in Urban Environments},
	journal = {Preprints}
}