Pane, E. P. and Siahaan, F. E. (2023) “Analysis of Pollution Levels of Heavy Metals of Lead (Pb) And Copper (Cu) In Freshwater Fish In Lake Toba Water”, JST (Jurnal Sains dan Teknologi), 12(2), pp. 385–395. doi: 10.23887/jstundiksha.v12i2.53714.