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 @book{nelsen:1997,
  title={Proofs without Words: Exercises in Visual Thinking},
  author={Roger B. Nelsen},
  year={1997},
  publisher={The Mathematical Association of America}
}

@book{nelsen:2020,
  title={Proofs Without Words II: More Exercises in Visual Thinking},
  author={Roger B. Nelsen},
  year={2020},
  publisher={American Mathematical Society}
}


@article{quinlan2013geogebra,
  title={GeoGebra as a frontend to generating graphics for LaTeX},
  author={Quinlan, James},
  journal={North American GeoGebra Journal},
  volume={2},
  number={1},
  year={2013}
}