Optimization of extraction of chitin from procambarus clarkia shell by Box-Behnken designFang Dong, Hailong Qiu, Shaoqian Jia, Cuiping Dai, Qingxin Kong and Changliang XuE3S Web Conf., 38 (2018) 02010DOI: https://doi.org/10.1051/e3sconf/20183802010