I. Basra, L. Silalahi, W. D. Pratama, and F. A. Joelyna, “Pretreatment of palm oil mill effluent (POME) for Spirulina cultivation”, J. emerg. sci. eng., vol. 1, no. 2, pp. 57–62, Dec. 2023, doi: 10.61435/jese.2023.12.