There are several papers that deal with flexibility in softwarized wireline and wireless networks. We have recently (1/2019) published a comprehensive survey on "Flexibility in Softwarized Networks: Classifications and Research Challenges", which contains a well selected list of related state of the art papers. In addition, this survey also elaborates on the use of "flexibility" in other areas such as management, software engineering, smart grid, process automation. The survey is freely available as pre-print [1].