., H., Suryana, N. and 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(4.36), pp. 1367–1372. doi:10.14419/ijet.v7i4.36.28988.