@inproceedings{pme336559-simasinstructionallang,
  title={Instructional Language in School Textbook Proofs: a Cross-cultural Study},
  author={Simas, Fabio Luiz Borges and Fischer, Michael and Amaral, Rúbia Barcelos},
  booktitle={Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1},
  year={2026},
  pages={1363--1370},
  publisher={Psychology of Mathematics Education (PME)},
  issn={2790-3648}
}