TY - RPRT TI - Standard Reference Materials A reference method for the determination of calcium in serum AU - Mandel, John AU - Young, Donald S AU - Cali, J Paul PY - 1972 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-36 DO - 10.6028/NBS.SP.260-36 ER -