Sauer, S. P. A.; Schreiber, M.; Ramos da Silva, M.; Thiel, W. Benchmarks for Electronically Excited States: A Comparison of Noniterative and Iterative Triples Corrections in Linear Response Coupled Cluster Methods: CCSDR(3) versus CC3. Journal of Chemical Theory and Computation2009, 5, 555–564.
Ramos da Silva, M.; Schreiber, M.; Sauer, S. P. A.; Thiel, W. Benchmarks for electronically excited states: Time-dependent density functional theory and density functional theory based multireference configuration interaction. Journal of Chemical Physics2008, 129, 104103.