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Luppi, E., Weissker, H.-C., Bottaro, S., Sottile, F., Véniard, V., Reining, L., & Onida, G. (2008). Accuracy of the pseudopotential approximation in ab initio theoretical spectroscopies. Physical Review B, 78, 245124. https://doi.org/10.1103/PhysRevB.78.245124

Palummo, M., Bruno, M., Pulci, O., Luppi, E., Degoli, E., Ossicini, S., & Del Sole, R. (2007). Ab-initio electronic and optical properties of low dimensional systems: From single particle to many-body approaches. SURFACE SCIENCE, 601, 2696-2701. https://doi.org/10.1016/j.susc.2006.12.019 (Original work published)

Pulci, O., Marsili, M., Luppi, E., Hogan, C., Garbuio, V., Sottile, F., … Del Sole, R. (2005). Electronic excitations in solids: Density functional and Green\textquoterights function theory. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 242, 2737-2750. https://doi.org/10.1002/pssb.200541115