Nonnegative matrix factorization and sparse representation for the automated detection of periodic limb movements in sleep. - Mehrnaz Shokrollahi; Sridhar Krishnan 001; Dustin D. Dopsa; Ryan T. Muir; Sandra E. Black; Richard H. Swartz; Brian J. Murray; Mark I. Boulos (Medical Biol. Eng. Comput., 2016)