Mu He, Alberto Martinez Alba, Arsany Basta, Andreas Blenk, Wolfgang Kellerer:
"Flexibility in Softwarized Networks: Classifications and Research Challenges"
accepted for IEEE Communication Surveys and Tutorials, 2019.
You can find the publication on IEEE explore: https://doi.org/10.1109/COMST.2019.2892806
For more information on network flexibility see www.networkflexibility.org