PSI4: an ab initio quantum chemistry software package

Copyright (c) 2007-2013 The PSI4 Developers.

The copyrights for code used from other parties are included in

the corresponding files.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License along

with this program; if not, write to the Free Software Foundation, Inc.,

51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

The journal article reference describing Psi4 is:

Justin 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),

Psi4: an open-source ab initio electronic structure program.

WIREs Comput Mol Sci, 2: 556–565. doi: 10.1002/wcms.93