@article {3820,
	title = {Optimizing Multi-Query Evaluation in Federated RDF Systems},
	journal = {IEEE Transactions on Knowledge and Data Engineering (TKDE)},
	volume = {33},
	year = {2021},
	pages = {1692--1707},
	doi = {10.1109/TKDE.2019.2947050},
	author = {Peng Peng and Qi Ge and Lei Zou and Tamer Ozsu and Zhiwei Xu and Dongyan Zhao}
}
