Media type: E-Article Title: Pi-Pair Photoproduction Below 850 MeV Contributor: Palazzi, G. Diambrini; Sette, G.; Giannini, I.; Grianti, F.; Santroni, A. imprint: American Physical Society (APS), 1968 Published in: Physical Review Letters Language: English DOI: 10.1103/physrevlett.21.1463 ISSN: 0031-9007 Keywords: General Physics and Astronomy Origination: Footnote: