TY - RPRT TI - Models for the migration of additives in polyolefins AU - Smith, L E AU - Chang, S S AU - McCrackin, F L AU - Sanchez, I C AU - Senich, G A PY - 1980 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 80-1999 DO - 10.6028/NBS.IR.80-1999 ER -