@inproceedings{Beigel97,
  title = {Closure Properties of GapP and #P},
  author = {Richard Beigel},
  year = {1997},
  url = {http://computer.org/proceedings/istcs/8037/80370144abs.htm},
  researchr = {https://researchr.org/publication/Beigel97},
  cites = {0},
  citedby = {0},
  pages = {144-146},
  booktitle = {ISTCS},
}