Interference effect as resonance killer of newly observed charmoniumlike states Y(4320) and Y(4390) Dian-Yong Chen, Xiang Liu and Takayuki Matsuki Eur. Phys. J. C, 78 2 (2018) 136 Published online: 17 February 2018 DOI: 10.1140/epjc/s10052-018-5635-1