For causal structures with latent variables and a fixed node order, the paper fully determines the observational dominance order at three visible nodes and bounds it at four nodes, showing that most equivalence classes require non-CI constraints.
Quantum vi- olations in the Instrumental scenario and their relations to the Bell scenario.Quantum, 3:186, September 2019
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The Observational Partial Order of Causal Structures with Latent Variables
For causal structures with latent variables and a fixed node order, the paper fully determines the observational dominance order at three visible nodes and bounds it at four nodes, showing that most equivalence classes require non-CI constraints.