@article{HellwigVolkmann2013,
  author    = {Angelika Hellwig and Lutz Volkmann},
  title     = {Maximally edge-connected and vertex-connected graphs and digraphs : a survey},
  journal   = {Discrete mathematics},
  volume    = {Vol. 308},
  number    = {Iss. 15},
  pages     = {3265 -- 3296},
  year      = {2013},
}