00275nam a2200133Ia 4500020000900000082000900009100003200018245005500050250000600105260000900111300000900120500000600129650000600135  aNULL  aNULL  aGupta, P. P. / Malik, G. S. 0aCalculus Of Finite Difference & Numerical Analysis  a-  a-b-  aNULL  a0  a-