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author = {Weitao Yang and Paula Mori-Sanchez and Aron J. Cohen},  title = {{Insight and progress in density functional theory}},  }  @article{Nourafkan_2012,  doi = {10.1103/physrevlett.109.017001},  url = {http://dx.doi.org/10.1103/physrevlett.109.017001},  year = {2012},  month = {jul},  publisher = {American Physical Society ({APS})},  volume = {109},  number = {1},  author = {R. Nourafkan and F. Marsiglio and G. Kotliar},  title = {{Model of the Electron-Phonon Interaction and Optical Conductivity of Ba 1 - x K x {BiO} 3 Superconductors}},  journal = {Phys. Rev. Lett.},  }