00239nam a22000977a 4500082001800000100002200018245003300040300000800073490002100081650003900102  a 541.2254 KUL  aKularathne K.W.S.  aMolecular messes of polymers  a46p  alevel 5 PSU 3122  aMolecular polymersapolymersaousl