Photoproduction of neutral pion pairs from the proton M. Wolf, J. Ahrens, R. Beck, V. Hejny, J.D. Kellie, M. Kotulla, B. Krusche, V. Kuhr, R. Leukel, V. Metag et al. (11 more) Eur. Phys. J. A, 9 1 (2000) 5-8 Published online: 15 September 2000 DOI: 10.1007/s100500070048