., H., Suryana, N., & Samad Hasan Basari, A. (2018). Increase Robustness SDAE with Imputing Missing Value To Eliminate Users Sparse Data in Case E-Commerce Recommender System. International Journal of Engineering & Technology, 7(4.44), 137-142. https://doi.org/10.14419/ijet.v7i4.44.26969