Lotrich, V.; Flocke, N.; Ponton, M.; Yau, A. D.; Perera, A.; Deumens, E.; Bartlett, R. J. (5 May 2008). "Parallel implementation of electronic structure energy, gradient, and Hessian calculations". The Journal of Chemical Physics. 128 (19). doi:10.1063/1.2920482. ISSN0021-9606.
Lotrich, V.; Flocke, N.; Ponton, M.; Yau, A. D.; Perera, A.; Deumens, E.; Bartlett, R. J. (5 May 2008). "Parallel implementation of electronic structure energy, gradient, and Hessian calculations". The Journal of Chemical Physics. 128 (19). doi:10.1063/1.2920482. ISSN0021-9606.