@article{HellwigVolkmann2008,
  author    = {Hellwig, Angelika and Volkmann, Lutz},
  title     = {Maximally edge-connected and vertex-connected graphs and digraphs : a survey},
  series = {Discrete mathematics},
  volume    = {Vol. 308},
  journal   = {Discrete mathematics},
  number    = {Iss. 15},
  issn      = {1872-681X (E-Journal); 0012-365X (Print)},
  pages     = {3265 -- 3296},
  year      = {2008},
  language  = {en}
}
@article{HellwigVolkmann2008,
  author    = {Hellwig, Angelika and Volkmann, Lutz},
  title     = {The connectivity of a graph and its complement},
  series = {Discrete applied mathematics},
  volume    = {Vol. 156},
  journal   = {Discrete applied mathematics},
  number    = {Iss. 17},
  issn      = {0166-218X (E-Journal); 1872-6771 (E-Journal); 0166-218X (Print)},
  pages     = {3325 -- 3328},
  year      = {2008},
  language  = {en}
}