N. Butploy, K. Khiewwan, J. Ongate, T. Kueathaweekun, and P. Maneechot, “Systematic Approach to NoSQL Indexing: Validating the ESR (Equality, Sort, Range) Heuristic for Query Performance”, IJEEI, vol. 14, no. 2, pp. 563–570, Jun. 2026, doi: 10.52549/ijeei.v14i2.7670.