00307nam a2200121Ia 4500008004100000020001800041082001500059100002400074245002500098250000800123260004600131300000800177190710s9999    xx            000 0 und d  a81-207-1747-3  a372.7 Si 1  aSidhu, Kulbir Singh 0aTeaching mathematics  a4th  aNew DelhibSterling Publishers Privc2011  a413