CLADAG 2021 BOOK OF ABSTRACTS AND SHORT PAPERS13th Scientific Meeting of the Classification and Data Analysis Group-Firenze, September 9-11, 2021 Giovanni C. Porzio; Carla Rampichini; Chiara Bocci. CLADAG 2021 BOOK OF ABSTRACTS AND SHORT PAPERS 13th Scientific Meeting of the Classification and Data Analysis Group-Firenze, September 9-11, 2021, Firenze University Press, pp.392-395, 2021, 978-88-5518-340-6. ⟨10.36253/978-88-5518-340-6⟩