Farrington, CP; Unkel, S; Anaya-Izquierdo, K; (2012) The relative frailty variance and shared frailty models. Journal of the Royal Statistical Society Series B, Statistical methodology, 74. pp. 673-696. ISSN 1369-7412 DOI: https://doi.org/10.1111/j.1467-9868.2011.01021.x Full text not available from this repository.

Molenberghs, G; Beunckens, C; Sotto, C; Kenward, MG; (2008) Every missingness not at random model has a missingness at random counterpart with equal fit. Journal of the Royal Statistical Society Series B, Statistical methodology, 70. pp. 371-388. ISSN 1369-7412 https://researchonline.lshtm.ac.uk/id/eprint/7959 Full text not available from this repository.

Clarke, PS; Smith, PWF; (2004) Interval estimation for log-linear models with one variable subject to non-ignorable non-response. Journal of the Royal Statistical Society Series B, Statistical methodology, 66 (2). pp. 357-68. ISSN 1369-7412 DOI: https://doi.org/10.1111/j.1369-7412.2003.04973.x Full text not available from this repository.