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title = {{Neutrino opacities in nuclear matter}},  journal = {Nuclear Physics A},  }  @article{Horowitz_1997,  doi = {10.1103/physrevd.55.4577},  url = {http://dx.doi.org/10.1103/PhysRevD.55.4577},  year = {1997},  month = {apr},  publisher = {American Physical Society ({APS})},  volume = {55},  number = {8},  pages = {4577--4581},  author = {C. J. Horowitz},  title = {{Neutrino trapping in a supernova and the screening of weak neutral currents}},  journal = {Physical Review D},  }