P. Nguyen Hong, N. V. G. Nguyễn, U. P. Le Thi, and L. Le Tri, “EFFECTS OF GRANULATED BIO-ORGANIC NPK FERTILIZER ON IMPROVING ORANGE YIELD AND SOIL HEALTH IN THANH HOA PROVINCE”, HDUJS, vol. 81, no. 11, pp. 54-62, Nov. 2025.