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| 001 | 1544 | ||
| 011 | _a00131954 | ||
| 090 | _a1544 | ||
| 100 | _a20170516 frey50 | ||
| 101 | _afre | ||
| 102 | _aFR | ||
| 200 | _aEducational studies in mathematics ESM | ||
| 207 | _avol 18 n° 1 february 1987 | ||
| 210 |
_aHolland _cD. Reidel publishing company |
||
| 215 | _d24 | ||
| 099 | _tSER | ||
| 500 | _aESM | ||