Interaction of Zn(II) and Cu(II) with ε-poly-L-lysine and properties of the complexesYanyan Xie, Mengya Gao, Yang Liu, Qiang Fu, Guoliang Wang, Yujie Dai and Shiru JiaE3S Web Conf., 131 (2019) 01003DOI: https://doi.org/10.1051/e3sconf/201913101003