Bennett, Nathan, Srikanth K. Iyer, and Sreenivasa Rao Jammalamadaka. 2016. “Semiparametric Models With Covariates for Lifetime Data under a General Censoring Scheme With an Application to Contingent Valuation”. Statistica 76 (4):327-39. https://doi.org/10.6092/issn.1973-2201/6140.