@article{HellwigVolkmann2013,
  author    = {Angelika Hellwig and Lutz Volkmann},
  title     = {Sufficient conditions for graphs to be λ′-optimal, super-edge-connected, and maximally edge-connected},
  journal   = {Journal of graph theory},
  volume    = {Vol. 48},
  number    = {Iss. 3},
  pages     = {228 -- 246},
  year      = {2013},
}