Variational matrix-product-state approach to quantum impurity models. Weichselbaum, A., Verstraete, F., Schollwöck, U., Cirac, J. I., & Von Delft, J. Physical Review B - Condensed Matter and Materials Physics, 80(16):5, October, 2009. arXiv: cond-mat/0504305 ISBN: 1098-0121
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