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title = {{Direct observation of vortex dynamics in two-dimensional Josephson-junction arrays}},  journal = {{IEEE} Trans. Appl. Supercond.},  }  @article{Fazio_2001,  doi = {10.1016/s0370-1573(01)00022-9},  url = {http://dx.doi.org/10.1016/s0370-1573(01)00022-9},  year = {2001},  month = {dec},  publisher = {Elsevier {BV}},  volume = {355},  number = {4},  pages = {235--334},  author = {R Fazio},  title = {{Quantum phase transitions and vortex dynamics in superconducting networks}},  journal = {Physics Reports},  }