TY - RPRT TI - Standard Reference Materials : Accuracy of solution x-ray spectrometric analysis of copper-base alloys/ AU - Flitsch, Richard AU - Alvarez, Robert PY - 1965 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-5 DO - 10.6028/NBS.SP.260-5 ER -