004590000a22002050004500650001600000650001000016650001300026650001400039082001900053530000600072100001900078100002300097245007500120260001000195260000900205300000800214041000800222942000800230999001500238  aMathematics  aStudy  aTeaching  aEducation  a510bM833scUN  aM  aMorris, Robert  aArora, S. Manmohah  aStudies in mathematics education; moving into the twenty-first century  aParis  c1992  avol  aEng  cGEN  c7086d7086