TY - RPRT TI - A report on the certification of an absolute molecular mass distribution polymer standard: standard reference materials 2881 AU - Guttman, Charles M AU - Flynn, Kathleen M AU - Wallace, William E AU - Kearsley, Anthony J PY - 2008 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 7512 DO - 10.6028/NIST.IR.7512 ER -