@article{DelgrandeSchaubTompits2006,
  author    = {James Patrick Delgrande and Torsten H. Schaub and Hans Tompits},
  title     = {An Extended Query language for action languages (and its application to aggregates and preferences)},
  url       = {http://www2.in.tu-clausthal.de/~tmbehrens/NMR_Proc_TR4.pdf},
  year      = {2006},
}