TY - RPRT TI - Standard Reference Materials : Preparation and use of superconductive fixed point devices, SRM 767/ AU - Soulen, Jr, R J AU - Schooley, J F PY - 1972 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-44 DO - 10.6028/NBS.SP.260-44 ER -