00323nam a2200121Ia 4500008004100000100005000041245001300091260005100104300000900155650001200164942000800176999001700184190216s9999||||xx |||||||||||||| ||und||  a"Ramakrishnan Tv,Subramanyam Sv,Vishveshwara" 0aClass Ix  bNational Council Of Educational Researchc1990  a193p  aPhysics  cREF  c36100d36100