@techreport{RoocksMoeller2013,
  author    = {Patrick Roocks and Bernhard M{\"o}ller},
  title     = {An algebra of database preferences},
  institution = {Fakult{\"a}t f{\"u}r Angewandte Informatik},
  series    = {Reports / Technische Berichte der Fakult{\"a}t f{\"u}r Angewandte Informatik der Universit{\"a}t Augsburg},
  number    = {2013-08},
  year      = {2013},
}