doi dblp P3RPQ: Pregel-Based Parallel Provenance-Aware Regular Path Query Processing on Large RDF Graphs Yueqi Xin | Bingyi Zhang | Xin Wang | Qiang Xu | Zhiyong Feng Companion of the The Web Conference 2018 on The Web Conference 2018, WWW 2018, Lyon , France, April 23-27, 2018