000			00363 a2200157 4500
001			1666
011			_a00131954
090			_a1666
100			_a20170516 frey50
101			_afre
102			_aFR
200			_aEducational studies in mathematics ESM
207			_avol 45 n° 1-3 2001
210			_aHolland _cD. Reidel publishing company
215			_d24
099			_tSER
500			_aESM