Alexander Grigoriev Joyce van Loon Maxim Sviridenko Marc Uetz Tjark Vredeveld Bundle Pricing with Comparable Items. 475-486 2007 conf/esa/2007 ESA http://dx.doi.org/10.1007/978-3-540-75520-3_43 db/conf/esa/esa2007.html#GrigorievLSUV07