title: Comment on "from subtle to substantial: role of metal ions on pi-pi interactions".
authors.affiliation: Dipartimento di Chimica, Università di Firenze, Sesto Fiorentino, Italy. chelli@chim.unifi.it
authors.forename: Riccardo
authors.initials: R
authors.lastname: Chelli
authors.forename: Piero
authors.initials: P
authors.lastname: Procacci