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001 1477
011 _a00131954
090 _a1477
100 _a20170516 frey50
101 _afre
102 _aFR
200 _aEducational studies in mathematics ESM
207 _avol 9 n°2 may 1978
210 _aHolland
_cD. Reidel publishing company
215 _d24
099 _tSER
500 _aESM