title: Comment on "The Quadruple Bonding in C2Reproduces the Properties of the Molecule".
authors.affiliation: Fachbereich Chemie, Philipps-Universität Marburg, 35032, Marburg, Germany.
authors.forename: Gernot
authors.initials: G
authors.lastname: Frenking
authors.affiliation: Fachbereich Chemie, Philipps-Universität Marburg, 35032, Marburg, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Hermann
keywords: C2; bond order; bond strength; bonding analysis; electronic state; multiple bonding; σ bonding