00329nam a2200133Ia 4500008004100000020001800041082001100059082001000070100002200080245002700102260001400129260004300143260000900186230118s9999||||xx |||||||||||||| ||und||  a0-07-099572-9  a515.35  bSIM/D  ageorge fbsimmons 0adifferential equations  anew delhi  btata mcgrawhill publishing company ltd  c1972