TY - GEN AU - Christoph Witzgall C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1986-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.1225 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1986 TI - The parametric cost-revenue model (PAREC) for electronic message service systems: ER -