TY - JOUR AU - Larry DeWerd AU - J Micka AU - R Laird AU - D Pearson AU - M O'brien AU - P Lamperti C2 - Medical Physics DA - 2002-01-01 LA - en M1 - 29 PB - Medical Physics PY - 2002 TI - The Effect of Spectra on Calibration and Measurement With Mammographic Ionization Chambers ER -