00317nam a2200109Ia 4500008004100000100002000041245003800061260005800099300001000157650001900167650002100186220216s9999    xx            000 0 und d  aKarunaratne S W 0aNatural rubber and the synthetics  bRubber Research Institute of Sri Lanka Bulletinc1985  a49-50  aNatural rubber  aSynthetic rubber