Y. H. Bertham, Z. Arifin, and A. D. Nusantara, “The Improvement of Yield and Quality of Soybeans in a Coastal Area Using Low Input Technology Based on Biofertilizers”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 9, no. 3, pp. 787–791, May 2019.