Su In Park, Kwang Won Lee, Hoon Cha and Moon Sam Shin 2021. Clinical Efficacy of Wrinkle Improvement Right After using Antiaging Cosmetics containing Palmitoyl-GHK-R4 Peptide. Turkish Journal of Computer and Mathematics Education (TURCOMAT). 12, 13 (Jul. 2021), 6058–6062. DOI:https://doi.org/10.17762/turcomat.v12i13.9881.