1. REL4D: Abe M, Iikura H, Kamiya M, Nakajima T, Yanagisawa S, Yanai T.
2. Yanai T, Kamiya M, Kawashima Y, Nakajima T, Nakano H, Nakao Y, Sekino H, Paulovic J, Tsuneda T, Yanagisawa S, Hirao K (2004) The UTChem program package is available on http://utchem.qcl.t.u-tokyo.ac.jp/
3. Visscher L, Visser O, Aerts H, Merenga H, and Nieuwpoort WC (1994) Comput Phys Commun 81: 120.
4. Saue T, Fægri K, Jr, Helgaker T, and Gropen O (1997) Mol Phys 91: 937.
5. Yanai T, Nakajima T, Ishikawa Y, and Hirao K (2001) J Chem Phys 114: 6526.