@article{Blass15-1,
  title = {Negative Probability},
  author = {Andreas Blass},
  year = {2015},
  url = {http://eatcs.org/beatcs/index.php/beatcs/article/view/317},
  researchr = {https://researchr.org/publication/Blass15-1},
  cites = {0},
  citedby = {0},
  journal = {Bulletin of the EATCS},
  volume = {115},
}