Feature analysis of multidisciplinary scientific collaboration patterns based on PNAS Zheng Xie, Miao Li, Jianping Li, Xiaojun Duan and Zhenzheng Ouyang EPJ Data Sci., 7 1 (2018) 5 Published online: 05 March 2018 DOI: 10.1140/epjds/s13688-018-0134-z