Ramadhan, Nur Ghaniaviyanto, Aji Gautama Putrada, and Maman Abdurohman. 2019. “Improving Smart Lighting With Activity Recognition Using Hierarchical Hidden Markov Model”. Indonesian Journal on Computing (Indo-JC) 4 (2):43-54. https://doi.org/10.34818/INDOJC.2019.4.2.307.