Avakyan, E. Z. Interactions of η, η' - Mesons  with Heavy Quarks / E. Z. Avakyan, S. L. Avakyan // Actual Problems of Microworld Physics : Proceedings of International School-Seminar, Gomel, 23 july-03 august 2007. Vol. 2 / Joint institute for nuclear research ; editors : A. Ilyichev [et al.]. — Dubna : JINR, 2008. — P. 127-137.