Monitoring of the HERA-B RICH photo detector Calcao, H. ; Carvalho, J. ; Goncalves, M. ; Ivaniouchenkov, I. ; Moita, F. Abstract Publication: IEEE Transactions on Nuclear Science Pub Date: June 1999 DOI: 10.1109/23.775547 Bibcode: 1999ITNS...46..377C