@article{PahlSiZhang2013,
  author    = {Mario Pahl and Aung Si and Shaowu Zhang},
  title     = {Numerical cognition in bees and other insects},
  journal   = {Frontiers in Comparative Psychology},
  doi       = {10.3389/fpsyg.2013.00162},
  url       = {http://journal.frontiersin.org/Journal/10.3389/fpsyg.2013.00162/full},
  year      = {2013},
}