deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index a089a6e..ed0ba7f 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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title = {{{TRIGONOMETRIC} {PARALLAXES} {OF} {MASSIVE} {STAR}-{FORMING} {REGIONS}. {IX}. {THE} {OUTER} {ARM} {IN} {THE} {FIRST} {QUADRANT}}},  journal = {{ApJ}},  }  @article{Xu_2013,  doi = {10.1088/0004-637x/769/1/15},  url = {http://dx.doi.org/10.1088/0004-637x/769/1/15},  year = {2013},  month = {apr},  publisher = {{IOP} Publishing},  volume = {769},  number = {1},  pages = {15},  author = {Y. Xu and J. J. Li and M. J. Reid and K. M. Menten and X. W. Zheng and A. Brunthaler and L. Moscadelli and T. M. Dame and B. Zhang},  title = {{{ON} {THE} {NATURE} {OF} {THE} {LOCAL} {SPIRAL} {ARM} {OF} {THE} {MILKY} {WAY}}},  journal = {{ApJ}},  }