“Semi Refine Carrageenan from Seaweed Eucheuma cottonii Various Regional Origins Through Extraction of Various Alkalis: Semi Refine Karagenan dari Rumput Laut Eucheuma cottonii Berbagai Asal Daerah Melalui Ekstraksi Berbagai Alkali” (2022) Procedia of Social Sciences and Humanities, 3, pp. 1166–1172. doi:10.21070/pssh.v3i.245.