1 Introduction
2 Method for Finding, Selecting, and Characterizing Relevant Material
2.1 Selection of a Comprehensive Method
2.2 Identification and Selection of Literature
2.3 Analysis of Selected Material
2.4 Threats to Validity
3 Applications
4 Graph Features
5 Methods for Graph Analysis
6 Taxonomy
7 Future Research Directions
8 Reproducibility
9 Conclusion