TY  - CHAP
LA  - eng
PY  - 1985
SP  - 342-351
T3  - Proceedings of the Ninth International Conference for the Psychology of Mathematics Education
TI  - Selected results from the rational number project
UR  - https://nbn-resolving.org/urn:nbn:de:0070-bipr-18249
Y2  - 2026-01-20T13:41:47
ER  -