Syahputri H, De Lux Putra E, Rahman Harun F. Determinination Of Iron, Potassium, Calcium, And Sodium In The Fruit Of Guava (Syzygium Aqueum) And Guava Semarang (SyzygiumSamarangense) In Spectrophotometry Atomic Absorpti. IJSTM [Internet]. 2023 Jan. 9 [cited 2026 Jan. 22];4(1):118-21. Available from: https://ijstm.inarah.co.id/index.php/ijstm/article/view/717