M. Ghulamahdi, R. Agustian, I. Lubis, M. Murdianto, and P. Taylor, “Growth, Productivity and Land Equivalent Ratio of Soybean-Corn Intercropping on the Different Potassium and Husk Ash Dose under Saturated Soil Culture on Tidal Swamp”, IJSBAR, vol. 36, no. 7, pp. 170–182, Dec. 2017.