@article {acgm,
    AUTHOR = {Artal, E. and Cogolludo, J.I. and {Guerville-Ball\'e}, B. and Marco, M.\'A.},
     TITLE = {An arithmetic {Z}ariski pair of line arrangements with
              non-isomorphic fundamental group},
   JOURNAL = {Rev. R. Acad. Cienc. Exactas F\'is. Nat. Ser. A Mat. RACSAM},
  FJOURNAL = {Revista de la Real Academia de Ciencias Exactas, F\'isicas y
              Naturales. Serie A. Matematicas. RACSAM},
    VOLUME = {111},
      YEAR = {2017},
    NUMBER = {2},
     PAGES = {377--402},
      ISSN = {1578-7303,1579-1505},
       DOI = {10.1007/s13398-016-0298-y},
       URL = {https://doi.org/10.1007/s13398-016-0298-y},
}

@Article{Libgober1986,
  author   = {A. Libgober},
  journal  = {J. Reine Angew. Math.},
  title    = {On the homotopy type of the complement to plane algebraic curves},
  year     = {1986},
  pages    = {103--114},
  volume   = {367},
  fjournal = {Journal f{\"u}r die Reine und Angewandte Mathematik},
}

@article {andreotti1959,
    AUTHOR = {Andreotti, A. and Frankel, T.},
     TITLE = {The {L}efschetz theorem on hyperplane sections},
   JOURNAL = {Ann. of Math. (2)},
  FJOURNAL = {Annals of Mathematics. Second Series},
    VOLUME = {69},
      YEAR = {1959},
     PAGES = {713--717},
      ISSN = {0003-486X},
       DOI = {10.2307/1970034},
       URL = {https://doi.org/10.2307/1970034},
}

@Manual{Sagemath,
  title        = {Sage {M}athematics {S}oftware ({V}ersion 10.10)},
  author       = {Stein, W.A. and others},
  note         = {{\tt http://www.sagemath.org}},
  organization = {The Sage Development Team},
  year         = {2026},
  key          = {Sage},
}