TY - GEN AU - Alfred V Clark C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1995-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.IR.5043 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1995 TI - Report no. 30:: ER -