TY - RPRT TI - Recertification of the SRM 706a, a polystyrene AU - Guttman, C M AU - Blair, W R AU - Maurey, J R PY - 1998 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 6091 DO - 10.6028/NIST.IR.6091 ER -