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title = {{A Simplification of the Hartree-Fock Method}},  journal = {Physical Review},  }  @incollection{Resta_2007,  doi = {10.1007/978-3-540-34591-6_2},  url = {http://dx.doi.org/10.1007/978-3-540-34591-6_2},  year = {2007},  publisher = {Springer Science $\mathplus$ Business Media},  pages = {31--68},  author = {Raffaele Resta and David Vanderbilt},  title = {{Theory of Polarization: A Modern Approach}},  booktitle = {Topics in Applied Physics},  }