Characterization and Calibration of the Far Infra-Red Absolute Spectrophotometer (FIRAS) Fixsen, D. J. ; Mather, J. C. ; Cheng, E. ; Shafer, R. A. ; Eplee, R. E., Jr. ; Isaacman, R. B. ; Noerdlinger, P. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1991 Bibcode: 1991BAAS...23.1398F