Fan Zhang Shuming Shi Hao Yan Ji-Rong Wen Revisiting globally sorted indexes for efficient document retrieval. 371-380 2010 WSDM http://doi.acm.org/10.1145/1718487.1718534 conf/wsdm/2010 db/conf/wsdm/wsdm2010.html#ZhangSYW10