Nugroho, Rahma Khairunnisa, and Budi Purnomo Saputro. 2026. “Blockchain in Supply Chain Transparency, Flexibility, and Supplier Trust in a Lean Perspective: A Study of PT. Siam Cement Group Yogyakarta ”. Golden Ratio of Mapping Idea and Literature Format 6 (4):3008-28. https://doi.org/10.52970/grmilf.v6i4.2674.