Resonant behaviour in double charge exchange reaction of πmesons on the nuclear photoemulsion Yu. A. Batusov, T. D. Blokhintseva, G. B. Pontecorvo, F. Balestra, M. P. Bussa, G. Piragino and M. G. Schepkin Eur. Phys. J. A, 28 1 (2006) 11-17 Published online: 10 May 2006 DOI: 10.1140/epja/i2006-10010-4