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References
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.. [Aibar17] Sara Aibar, Carmen Bravo González-Blas, Thomas Moerman,
   Vân Anh Huynh-Thu, Hana Imrichova, Gert Hulselmans, Florian Rambow,
   Jean-Christophe Marine, Pierre Geurts, Jan Aerts, Joost van den Oord,
   Zeynep Kalender Atak, Jasper Wouters, Stein Aerts (2017),
   *SCENIC: single-cell regulatory network inference and clustering*,
   `Nature Methods <https://www.nature.com/articles/nmeth.4463>`__.