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title = {{Properties of Bethe-Salpeter Wave Functions}},  journal = {Phys. Rev.},  }  @incollection{Toulouse_2016,  doi = {10.1016/bs.aiq.2015.07.003},  url = {http://dx.doi.org/10.1016/bs.aiq.2015.07.003},  year = {2016},  publisher = {Elsevier {BV}},  pages = {285--314},  author = {Julien Toulouse and Roland Assaraf and Cyrus J. Umrigar},  title = {{Introduction to the Variational and Diffusion Monte Carlo Methods}},  booktitle = {Advances in Quantum Chemistry},  }