1. Relativistic quantum chemistry: the MOLFDIR program package
2. Saue, T.; Bakken, V.; Enevoldsen, T.; Helgaker, T.; Jensen, H. J. Aa.; Laerdahl, J. K.; Ruud, K.; Thyssen, J.; Visscher, L.Dirac, a relativistic ab initio electronic structure program, Release 3.2, 2000; http://dirac.chem.sdu.dk.
3. Grant, I. P.; Quiney, H. M.InRelativistic Electronic Structure Theory. Part 1. Fundamentals;Schwerdtfeger, P., Ed.Elsevier:Amsterdam, 2002; p107.
4. High Performance Computational Chemistry Group.NWChem, A Computational Chemistry Package for Parallel Computers, Version 4.5;Pacific Northwest National Laboratory:Richland, Washington 99352, 2003.
5. A new computational scheme for the Dirac–Hartree–Fock method employing an efficient integral algorithm