Rumbewas, Martha Ilona, Buraerah A. Hakim, and A. L Rantetampang A. L Rantetampang. “Factors Affecting of Pure K1 ”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 24, no. 7 (December 10, 2015): 50–59. Accessed September 11, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/5043.