references.bib

@article{ShufflingMathematicsProblems,
author         = {Rothkopf, Ernst Z. and Smith, Steven M.},
year           = {1984},
pages          = {341-358},
title          = {Contextual Enrichment and Distribution of Practice in the Classroom},
volume         = {3},
journal        = {Cognition and Instruction},
url            = {https://web.archive.org/web/20211006102326/http://people.tamu.edu/~stevesmith/SmithMemory/SmithRothkopf1984.pdf}
}

@misc{Tinycards,
  author       = {Duolingo},
  title        = {Tinycards Landing Page},
  url          = {https://web.archive.org/web/20160718080957/http://tinycards.duolingo.com/},
  year         = {2017}
}

@article{TinycardsShutdown,
  author       = {Duolingo},
  title        = {Tinycards Shutdown},
  year         = {2020},
  url          = {https://web.archive.org/web/20201110062104/https://forum.duolingo.com/comment/39200018}
}

@misc{Colourblindness,
  author       = {NEI},
  title        = {Colorblindness},
  year         = {2019},
  url          = {https://web.archive.org/web/20211005163407/https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness},
}

@article{ForgettingCurve,
  author          = {Murre, M.J Jaap and Dros, Joeri},
  journal         = {PLoS One},
  title           = {Replication and Analysis of Ebbinghaus’ Forgetting Curve},
  year            = {2015},
  url             = {https://web.archive.org/web/20210507064054/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4492928/}
}