F. S. Armi, U. Uju, and K. . Tarman, “Optimization of the functional beverage formula from nipah leaves (Nypa fruticans) using simplex lattice design method and in vitro immunostimulatory activity: Optimasi formula minuman fungsional dari daun nipah (Nypa fruticans) menggunakan metode simplex lattice design dan aktivitas imunostimulatori in vitro”, JPHPI, vol. 29, no. 8, pp. 740–754, Aug. 2026, doi: 10.17844/j50e3f37.