Reference:
  Author: Giorgio Gonnella and Stefan Kurtz
  Title: GfaPy: a flexible and extensible software library for handling sequence graphs in Python
  Journal: Bioinformatics
  Year: 2017
  DOI: 10.1093/bioinformatics/btx398
  PMID: 28645150
  URL: https://academic.oup.com/bioinformatics/article-abstract/doi/10.1093/bioinformatics/btx398/3883940/GfaPy-a-flexible-and-extensible-software-library
