Sacha Berger François Bry Tim Furche Benedikt Linse Andreas Schroeder Effective and Efficient Data Access in the Versatile Web Query Language Xcerpt. 219-224 2006 conf/ppswr/2006 PPSWR http://dx.doi.org/10.1007/11853107_16 db/conf/ppswr/ppswr2006.html#BergerBFLS06