00254nam a2200109Ia 4500008004100000100002600041245002000067260002100087650001200108942000700120999001700127190216s9999||||xx |||||||||||||| ||und||  aRamakrishnan Nair V G 0aIrumbum Urukkum  bBhasha Institute  aPhysics  cBK  c40475d40475