00375nam a22001337a 4500020001500000082001700015100002600032245007700058250002600135260003400161300000800195650001200203650002600215  a9555890056  a541.042 RAJ   aRajapaksha,R.M.Gamini  aපදාර්ථයේ අවස්ථා :padarthaye awastha (O/L)  aVidya Prakashana No.4  aPeradeniyab Universityc1996  a46p  aPhysics  aperadeniya university