N. V. Thiet, N. N. Luong, T. T. Quy Mai, H. T. Hang, N. X. Thu, and N. N. Phong, “Research and application of new enviromental-frendly technology without using chemicals for extraction of chitin from shrim shells”, AJB, vol. 34, no. 4, pp. 521–528, Jan. 2013.