Mahyeldi, Yahya Don, and Mohd Amy Azhar Mohd Arif, “Toward an Integrated IPOO–DMAIC Framework for Diagnosing and Improving Waqf Governance: A Conceptual Case Study Protocol for West Sumatra, Indonesia”, J.Panggaleh, vol. 2, no. 3, pp. 1–21, Oct. 2026.