The following citation should be used in any publication
utilizing the PSI3 program package:

"T. Daniel Crawford, C. David Sherrill, Edward F. Valeev, Justin T. Fermann,
Rollin A. King, Matthew L. Leininger, Shawn T. Brown, Curtis L. Janssen,
Edward T. Seidl, Joseph P. Kenny, and Wesley D. Allen, PSI 3.2, 2003."