1. Little RJ, Rubin DB. Statistical Analysis with Missing Data, vol. 793. Hoboken, NJ, USA: Wiley; 2019.
2. Rubin DB. Inference and missing data. Biometrika. 1976;63(3):581–92.
3. Galimard JE, Chevret S, Protopopescu C, Resche-Rigon M. A multiple imputation approach for MNAR mechanisms compatible with Heckman’s model. Stat Med. 2016;35(17):2907–20.
4. Miettinen OS. Theoretical epidemiology: principles of occurrence research in medicine. In Theoretical epidemiology: principles of occurrence research in medicine 1985 (pp. xxii-359).
5. Humphries M. Missing Data & How to Deal: an overview of missing data. Popul Res Cent. 2013; 45.