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title = {{Distribution of {CO} in the Milky Way}},  journal = {Annual Review of Astronomy and Astrophysics},  }  @article{Wu_2014,  doi = {10.1051/0004-6361/201322765},  url = {http://dx.doi.org/10.1051/0004-6361/201322765},  year = {2014},  month = {jun},  publisher = {{EDP} Sciences},  volume = {566},  pages = {A17},  author = {Y. W. Wu and M. Sato and M. J. Reid and L. Moscadelli and B. Zhang and Y. Xu and A. Brunthaler and K. M. Menten and T. M. Dame and X. W. Zheng},  title = {{Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm}},  journal = {Astronomy {\&} Astrophysics},  }