@article{anonnegativematrixfactorizationbased,
  title = {A Non-negative Matrix Factorization Based Method for Quantifying Rhythms of Activity and Sleep and Chronotypes Using Mobile Phone Data},
  author = {Talayeh Aledavood and Ilkka Kivimäki and Sune Lehmann and Jari Saramäki},
  year = {2020},
  eprint = {2009.09914},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2009.09914v1},
}