Kaya, Adrianus O W, et al. “The Effect of Gelling Agent Concentration on the Characteristic of Gel Produced From the Mixture of Semi-Refined Carrageenan and Glukomannan”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 20, no. 1, Feb. 2015, pp. 313-24, https://gssrr.org/JournalOfBasicAndApplied/article/view/3451.