Primandari, S.; Mulianti; Kaharudin, A.; Fernanda, Y.; Generousdi; Narayanan, B. Removal of Ferrous Using Citric Acid in Patchouli Oil Purification by Complexometry. Kompl. Ispolz. Min. Syra = Compl. Use of Min. Resour. 2023, 326, 81-87.