Identification of a recombinant equine coronavirus in donkey, China oleh Peng-Fei Qi, Xing-Yi Gao, Jing-Kai Ji, Yan Zhang, Shao-Hua Yang, Kai-Hui Cheng, Ning Cui, Man-Ling Zhu, Tao Hu, Xuan Dong, Bin Yan, Chang-Fa Wang, Hong-Jun Yang, Wei-Feng Shi, Wei Zhang