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Psi4: an open-source ab initio electronic structure programJustin M. Turney; Andrew C. Simmonett; Robert M. Parrish; Edward G. Hohenstein; Francesco A. Evangelista; Justin T. Fermann; Benjamin J. Mintz; Lori A. Burns; Jeremiah J. Wilke; Micah L. Abrams; Nicholas J. Russ; Matthew L. Leininger; Curtis L. Janssen; Edward T. Seidl; Wesley D. Allen; Henry F. Schaefer; Rollin A. King; Edward F. Valeev; C. David Sherrill; T. Daniel Crawford · 2012