00370nam a2200109Ia 4500008004100000100002000041245008300061260006500144300001100209650001900220650002100239220216s9999    xx            000 0 und d  aSamarappuli I N 0aSome technical and economic interactions between natural and synthetic rubbers  bBulletin of the Rubber Research Institute of Sri Lankac1993  a10-Aug  aNatural rubber  aSynthetic rubber