Andayani, I Gusti Ayu Sri, et al. “Optimization of Cryogenic Grinding As a Hair Sample Preparation Technique for Heavy Metal Concentration Analysis”. Bioscientist : Jurnal Ilmiah Biologi, vol. 14, no. 2, June 2026, pp. 706-14, doi:10.33394/bioscientist.v14i2.18503.