Tractable counting of the answers to conjunctive queries. Pichler, R. & Skritek, S. J. Comput. Syst. Sci., 79(6):984--1001, 2013.
Tractable counting of the answers to conjunctive queries [link]Paper  doi  bibtex   
@article{DBLP:journals/jcss/PichlerS13,
  author    = {Reinhard Pichler and
               Sebastian Skritek},
  title     = {Tractable counting of the answers to conjunctive queries},
  journal   = {J. Comput. Syst. Sci.},
  volume    = {79},
  number    = {6},
  pages     = {984--1001},
  year      = {2013},
  url       = {http://dx.doi.org/10.1016/j.jcss.2013.01.012},
  doi       = {10.1016/j.jcss.2013.01.012},
  timestamp = {Sun, 26 May 2013 01:00:00 +0200},
  biburl    = {http://dblp.dagstuhl.de/rec/bib/journals/jcss/PichlerS13},
  bibsource = {dblp computer science bibliography, http://dblp.org}
}

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