A One-Year Classroom-Randomized Trial of Mental Abacus Instruction for First- and Second-Grade Students. Barner, D., Athanasopoulou, A., Chu, J., Lewis, M., Marchand, E., Schneider, R. M., & Frank, M. C. J. Numer. Cogn., 3(3):540–558, 2017.
A One-Year Classroom-Randomized Trial of Mental Abacus Instruction for First- and Second-Grade Students [link]Paper  doi  bibtex   
@article{DBLP:journals/jnc/BarnerACLMSF17,
  author       = {David Barner and
                  Angeliki Athanasopoulou and
                  Junyi Chu and
                  Molly Lewis and
                  Elisabeth Marchand and
                  Rose M. Schneider and
                  Michael C. Frank},
  title        = {A One-Year Classroom-Randomized Trial of Mental Abacus Instruction
                  for First- and Second-Grade Students},
  journal      = {J. Numer. Cogn.},
  volume       = {3},
  number       = {3},
  pages        = {540--558},
  year         = {2017},
  url          = {https://doi.org/10.5964/jnc.v3i3.106},
  doi          = {10.5964/JNC.V3I3.106},
  timestamp    = {Mon, 26 Jun 2023 01:00:00 +0200},
  biburl       = {https://dblp.org/rec/journals/jnc/BarnerACLMSF17.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}

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