Measurement of branching fractions for ψ (3686) →γη', γη, and γπ0 / M. Ablikim, M. N. Achasov, S. Ahmed [et al.] // Physical Review D. 2017. Vol. 96, № 5. P. 052003-1-052003-9. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000645265
