Tran, Q. T. ., Z. . Islam, and M. . Kubo. “A Survey of Soil Fertility in Turfgrass Soil of Japanese Golf Courses by Using SOFIX Technique”. Asian Journal of Agriculture and Rural Development, vol. 15, no. 4, Nov. 2025, pp. 676-85, doi:10.55493/5005.v15i4.5773.