@article{ShakiSeryFischer2015,
  author    = {Samuel Shaki and Noa Sery and Martin H. Fischer},
  title     = {1 + 2 is more than 2 + 1: Violations of commutativity and identity axioms in mental arithmetic},
  journal   = {Journal of cognitive psychology},
  volume    = {27},
  number    = {4},
  pages     = {471 -- 477},
  doi       = {10.1080/20445911.2014.973414},
  year      = {2015},
}