Pionic transition from Y(4260) to Zc(3900) in a hadronic molecular scenarioDian-Yong Chen, Yu-Bing Dong, Ming-Tao Li and Wen-Ling WangEur. Phys. J. A, 52 10 (2016) 310DOI: https://doi.org/10.1140/epja/i2016-16310-0