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title = {{Real-space finite-difference approach for multi-body systems: path-integral renormalization group method and direct energy minimization method}},  journal = {Journal of Physics: Condensed Matter},  }  @article{Goto_2009,  doi = {10.1088/0953-8984/21/6/064231},  url = {http://dx.doi.org/10.1088/0953-8984/21/6/064231},  year = {2009},  month = {jan},  publisher = {{IOP} Publishing},  volume = {21},  number = {6},  pages = {064231},  author = {Hidekazu Goto and Kikuji Hirose},  title = {{Total-energy minimization of few-body electron systems in the real-space finite-difference scheme}},  journal = {Journal of Physics: Condensed Matter},  }