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| 100 | _a20170516 frey50 | ||
| 101 | _afre | ||
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| 200 | _aEducational studies in mathematics ESM | ||
| 207 | _avol 16 n°4 november 1985 | ||
| 210 |
_aHolland _cD. Reidel publishing company |
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| 215 | _d24 | ||
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| 500 | _aESM | ||