@article{sanchez2018causal,
  title={Causal discovery of feedback networks with functional magnetic resonance imaging},
  author={Sanchez-Romero, Ruben and Ramsey, Joseph D and Zhang, Kun and Glymour, MR K and Huang, Biwei and Glymour, Clark},
  journal={bioRxiv},
  pages={245936},
  year={2018},
  publisher={Cold Spring Harbor Laboratory},
  url={https://www.biorxiv.org/content/10.1101/245936v1.abstract}
}

@article{hyvarinen2013pairwise,
  title={Pairwise likelihood ratios for estimation of non-Gaussian structural equation models},
  author={Hyv{\"a}rinen, Aapo and Smith, Stephen M},
  journal={Journal of machine learning research: JMLR},
  volume={14},
  number={Jan},
  pages={111},
  year={2013},
  publisher={Europe PMC Funders},
  url             = {https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6834441/}
}