@inproceedings{pme336559-baccaglinifrankdiscove,
  title={DISCOVERING “WHYS” BEHIND THE CHANGE SIDE–CHANGE SIGN RULE IN ALGEBRA},
  author={Baccaglini-Frank, Anna and Nannini, Bernardo and Poli, Federica},
  booktitle={Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1},
  year={2026},
  pages={115--122},
  publisher={Psychology of Mathematics Education (PME)},
  issn={2790-3648}
}