Suppressing the QCD axion abundance by hidden monopoles

@article{Kawasaki2015SuppressingTQ,
  title={Suppressing the QCD axion abundance by hidden monopoles},
  author={Masahiro Kawasaki and Fuminobu Takahashi and Masaki Yamada},
  journal={Physics Letters B},
  year={2015},
  volume={753},
  pages={677-681}
}

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