M. H. Ramadhan, R. I. I. Putri, and Z. H. Zulkardi, “Designing Fractional Task using the PMRI Approach”, J. Pend. Mat. Rafa, vol. 8, no. 1, pp. 1–8, Jun. 2022, doi: 10.19109/jpmrafa.v8i1.10714.