Cook RD, Forzani LM, Tomassi DR. LDR: A Package for Likelihood-Based Sufficient Dimension Reduction. J. Stat. Soft. [Internet]. 2011 Mar. 1 [cited 2024 Nov. 24];39(3):1-20. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v039i03