@article{PSI3,
        Author = {T. D. Crawford and C. D. Sherrill and E. F. Valeev and J.
T. Fermann and R. A. King and M. L. Leininger and S. T. Brown and C. L.
Janssen and E. T. Seidl and J. P. Kenny and W. D. Allen},
        Journal = {J. Comp. Chem.},
        Pages = {1610-1616},
        Title = {PSI3: An open-source ab initio electronic structure package},
        Volume = {28},
        Year = {2007}
}