The ultrametric correlation matrix for modelling hierarchical latent concepts. - Carlo Cavicchia; Maurizio Vichi; Giorgia Zaccaria (Adv. Data Anal. Classif., 2020)

Gaussian mixture model with an extended ultrametric covariance structure. - Carlo Cavicchia; Maurizio Vichi; Giorgia Zaccaria (Adv. Data Anal. Classif., 2022)

Ultrametric models for hierarchical dimensionality reduction. - Giorgia Zaccaria (2022)

A model-based ultrametric composite indicator for studying waste management in Italian municipalities. - Carlo Cavicchia; Pasquale Sarnacchiaro; Maurizio Vichi; Giorgia Zaccaria (Comput. Stat., 2024)

Parsimonious ultrametric Gaussian mixture models. - Carlo Cavicchia; Maurizio Vichi; Giorgia Zaccaria (Stat. Comput., 2024)

Studying Hierarchical Latent Structures in Heterogeneous Populations with Missing Information. - Francesca Greselin; Giorgia Zaccaria (J. Classif., 2025)