TY - RPRT TI - Standard Reference Materials SRM 900, antiepilepsy drug level assay standard AU - Christensen, Richard G AU - Coxon, Bruce AU - Howell, Barbara F AU - Mandel, John AU - Paule, Robert C AU - Reeder, Dennis J AU - Schaffer, Robert PY - 1981 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-72 DO - 10.6028/NBS.SP.260-72 ER -