title: Do supra-antara paths really exist for 2 + 2 cycloaddition reactions? Analytical computation of the MC-SCF Hessians for transition states of ethylene with ethylene, singlet oxygen, and ketene.
authors.forename: F
authors.initials: F
authors.lastname: Bernardi
authors.forename: A
authors.initials: A
authors.lastname: Bottoni
authors.forename: M
authors.initials: M
authors.lastname: Olivucci
authors.forename: M A
authors.initials: MA
authors.lastname: Robb
authors.forename: H B
authors.initials: HB
authors.lastname: Schlegel
authors.forename: G
authors.initials: G
authors.lastname: Tonachini