Preparation and cytotoxicity evaluation of chitosan-sodium alginate composite gel 
Zhang Lin-pu, Wang Guan-hua, Lian Xiao-li, Li Yan-ni, Dai Xiao-hua
Chinese Journal of Tissue Engineering Research . 2014, (21): 3310 -3315 .  DOI: 10.3969/j.issn.2095-4344.2014.21.006