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APA Citation
Hernández-Alava, M., & Pudney, S. (2016). bicop: A Command for Fitting Bivariate Ordinal Regressions with Residual Dependence Characterized by a Copula Function and Normal Mixture Marginals. Stata journal, 16, 159–184. http://access.bl.uk/ark:/81055/vdc_100074434972.0x0004b9