@article{qian2015h, title={H-Tree: An Efficient Index Structurefor Event Matching in Content-BasedPublish/Subscribe Systems}, author={Qian, Shiyou and Cao, Jian and Zhu, Yanmin and Li, Minglu and Wang, Jie}, journal={IEEE Transactions on Parallel \& Distributed Systems}, number={6}, pages={1622--1632}, year={2015}, publisher={IEEE} }