@Article{RobinsRotnitzkyZhao1994,
  author =          {Robins, JM and Rotnitzky, A and Zhao, LP},
  title =          {Estimation of regression-coefficients when some regressors are not always observed},
  journal =          {Journal of the American Statistical Association},
  year =          {1994},
  volume =          {89},
  pages =          {846-866}
}

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