Manuel Úbeda-Flores
- A New Family of Trivariate Proper Quasi-copulas. KYBERNETIKA 43 (2007) n.1, 75-85.
- Extreme Distribution Functions of Copulas. KYBERNETIKA 44 (2008) n.6, 817-825.
- Quasi-Copulas with Quadratic Sections in One Variable. KYBERNETIKA 44 (2008) n.6, 879-890.