00257nam a2200097Ia 4500008004100000082001500041100001100056245005700067260002800124300000700152140113s9999    xx            000 0 und d  a655.2   J9  aI.S.I.  aProof correction for practices  & authors. IS :1250-  a1959bI.S.I.cNew Delhi  a21