https://www.cambridge.org/core/journals/political-analysis/article/abs/causal-inference-without-ignorability-identification-with-nonrandom-assignment-and-missing-treatment-data/E2FD7AB1CF5941D7A3065A235EEA3A8F
Causal Inference without Ignorability: Identification with Nonrandom Assignment and Missing...
Causal Inference without Ignorability: Identification with Nonrandom Assignment and Missing Treatment Data - Volume 21 Issue 2
causal inferenceidentification withwithoutignorabilityassignment