title: Commentaries on quantum similarity (1): Density gradient quantum similarity.
authors.affiliation: Institut de Química Computacional, Universitat de Girona, Girona 17071, Catalonia, Spain. quantumqsar@hotmail.com
authors.forename: Ramon
authors.initials: R
authors.lastname: Carbó-Dorca
authors.forename: Luz Dary
authors.initials: LD
authors.lastname: Mercado