@article{acompletecharacterizationofprojectivity,
  title = {A Complete Characterization of Projectivity for Statistical Relational Models},
  author = {Manfred Jaeger and Oliver Schulte},
  year = {2020},
  eprint = {2004.10984},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.10984v2},
}