TY - RPRT TI - Security metrics guide for information technology systems AU - Swanson, M AU - Bartol, N AU - Sabato, J AU - Hash, J AU - Graffo, L PY - 2003 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 800-55 DO - 10.6028/NIST.SP.800-55 ER -