@inproceedings{CASE-2018-LuoZ,
	author        = "Xin Luo 0001 and MengChu Zhou",
	booktitle     = "{Proceedings of the 14th International Conference on Automation Science and Engineering}",
	doi           = "10.1109/COASE.2018.8560481",
	isbn          = "978-1-5386-3593-3",
	pages         = "1406--1413",
	publisher     = "{IEEE}",
	title         = "{Unconstrained Non-negative Factorization of High-dimensional and Sparse Matrices in Recommender Systems}",
	year          = 2018,
}