References
- Efromovich, S. (2008), Nonparametric Curve Estimation: Methods, Theory, and Applications, New York: Springer Science & Business Media.
- Little, R., and Rubin, D. (1987), Statistical Analysis With Missing Data, New York: Wiley
- Rubin, D. (1976), “Inference and Missing Data,” Biometrika, 63, 581–592. DOI: 10.1093/biomet/63.3.581.