@conference {DBLP:conf/vldb/ZhaoYY07,
	title = {{G}raph {I}ndexing: {T}ree + {D}elta $>$= {G}raph},
	booktitle = {VLDB},
	year = {2007},
	pages = {938-949},
	author = {Peixiang Zhao and Yu, Jeffrey Xu and Philip S. Yu}
}
