@article{HellwigVolkmann2006,
  author    = {Hellwig, Angelika and Volkmann, Lutz},
  title     = {Lower bounds on the vertex-connectivity of digraphs and graphs},
  series = {Information processing letters},
  volume    = {Vol. 99},
  journal   = {Information processing letters},
  number    = {Iss. 2},
  issn      = {1872-6119 (E-Journal); 0020-0190 (Print)},
  pages     = {41 -- 46},
  year      = {2006},
  language  = {en}
}
@article{HellwigVolkmann2006,
  author    = {Hellwig, Angelika and Volkmann, Lutz},
  title     = {On connectivity in graphs with given clique number},
  series = {Journal of graph theory},
  volume    = {Vol. 52},
  journal   = {Journal of graph theory},
  number    = {Iss. 1},
  issn      = {03649024 ; 10970118},
  pages     = {7 -- 14},
  year      = {2006},
  language  = {en}
}
@article{HellwigVolkmann2006,
  author    = {Hellwig, Angelika and Volkmann, Lutz},
  title     = {Some upper bounds for the domination number},
  series = {The journal of combinatorial mathematics and combinatorial computing : JCMCC},
  volume    = {Vol. 57},
  journal   = {The journal of combinatorial mathematics and combinatorial computing : JCMCC},
  issn      = {0835-3026},
  pages     = {187 -- 209},
  year      = {2006},
  language  = {en}
}