00287nam a2200121Ia 45000030006000000080041000060400015000471000016000622450027000782600031001055460012001360050017001480STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, S.L.  aMathematical education  bMathematical Societyc1972  aEnglish20220125170027.0