Cuculescu, Ioan; Theodorescu, Radu - In: Journal of Multivariate Analysis 86 (2003) 1, pp. 48-71
Three types of unimodality (central convex, block, and star) are considered and the corresponding sets of unimodal copulas determined. Examples of star unimodal copulas, absolutely continuous, with a nonnull singular part, and even singular, are given. Necessary and sufficient conditions for a...