@inproceedings{pme336559-ikonenunboundednumberl,
  title={Unbounded Number Lines Reflect the Complexity of Rational Number Knowledge},
  author={Ikonen, Sofia and McMullen, Jake},
  booktitle={Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1},
  year={2026},
  pages={667--674},
  publisher={Psychology of Mathematics Education (PME)},
  issn={2790-3648}
}