@techreport{kharlamov2011value_tr,
  title={\href{https://pierre.senellart.com/publications/kharlamov2011value_tr.pdf}{Value Joins are Expensive over (Probabilistic) {XML}. Extended Version.}},
  author={Evgeny Kharlamov and Werner Nutt and Pierre Senellart},
  institution={KRDB Research Centre, Free University of Bozen--Bolzano},
  address={Bolzano, Italy},
  number={KRDB11-1},
  month=feb,
  year={2011},
}