Chen Li 0001Bin Wang 0015Xiaochun Yang 0001VGRAM: Improving Performance of Approximate Queries on String Collections Using Variable-Length Grams.303-3142007conf/vldb/2007VLDBhttp://www.vldb.org/conf/2007/papers/research/p303-li.pdfdb/conf/vldb/vldb2007.html#LiWY07