Iqbal, M., C. P. Wulandari, W. Yunanto, and G. I. P. Sari. “Mining Non-Zero-Rare Sequential Patterns On Activity Recognition”. Jurnal Matematika MANTIK, vol. 5, no. 1, May 2019, pp. 1-9, doi:10.15642/mantik.2019.5.1.1-9.