C. Pujiono, A. Taufiq Mukti, and W. Hastuti Satyantini, “Study of Pb Heavy Metal Pollution Level on Tannin Content of Seaweed (Kappaphycus alvarezii) in Bluto and Talango Sea Waters, Sumenep, East Java”, JAFH, vol. 10, no. 1, pp. 1–8, Jan. 2021.