Adwan, Ziad, and Nicola Sottocornola. “A Characterization of a Subclass of Separate Ratio-Type Copulas”. Statistics, Optimization & Information Computing 14, no. 4 (August 12, 2025): 1741-1755. Accessed October 13, 2025. http://47.88.85.238/index.php/soic/article/view/2493.