Photon production in proton-proton collisions at 23.1 GeV Fidecaro, M. ; Finocchiaro, G. ; Gatti, G. ; Giacomelli, G. ; Middelkoop, W. C. ; Yamagata, T. Abstract Publication: Il Nuovo Cimento Pub Date: April 1962 DOI: 10.1007/BF02785760 Bibcode: 1962NCim...24...73F