Pionic transition from Y(4260) to Zc(3900) in a hadronic molecular scenario Dian-Yong Chen, Yu-Bing Dong, Ming-Tao Li and Wen-Ling Wang Eur. Phys. J. A, 52 10 (2016) 310 Published online: 13 October 2016 DOI: 10.1140/epja/i2016-16310-0