Measurement of the matrix elements for the decays η →π+π-π0 and η/η′ →π0π0π0 / M. Ablikim, M. N. Achasov, X. C. Ai [et.al.] // Physical Review D. 2015. Vol. 92, № 1. P. 012014-1-012014-11. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000529866
