Reference:
  Author: Hélène Touzet and Jean-Stéphane Varré
  Title: Efficient and accurate P-value computation for Position Weight Matrices
  Journal: Algorithms for Molecular Biology
  Year: 2007
  Number: 2
  Pages: 15
  DOI: 10.1186/1748-7188-2-15
  PMID: 18072973
  URL: https://almob.biomedcentral.com/articles/10.1186/1748-7188-2-15
  eprint: https://almob.biomedcentral.com/track/pdf/10.1186/1748-7188-2-15
