anchor.diff:    archivePrefix = "arXiv",
        eprint = {1307.6212},
      primaryClass = "astro-ph.IM",
  -   keywords = {methods: data analysis, methods: miscellaneous, virtual observatory tools},
  +   keywords = {methods: data analysis, methods: miscellaneous, virtual
  +     observatory tools},
          year = 2013,
         month = oct,
        volume = 558,
  
positive.code:   archivePrefix = "arXiv",
       eprint = {1609.04153},
     primaryClass = "astro-ph.IM",
     keywords = {space vehicles: instruments, Galaxy: structure, astrometry, parallaxes, proper motions, telescopes},
         year = 2016,
        month = nov,
       volume = 595,
  
negative.code:   	Adsnote = {Provided by the SAO/NASA Astrophysics Data System},
    	Adsurl = {http://adsabs.harvard.edu/abs/2008gady.book.....B},
    	Author = {{Binney}, J. and {Tremaine}, S.},
    	Booktitle = {Galactic Dynamics: Second Edition, by James Binney
        and Scott Tremaine.~ISBN 978-0-691-13026-2 (HB).~Published by
        Princeton University Press, Princeton, NJ USA, 2008.},
    	Publisher = {Princeton University Press},
    	Title = {{Galactic Dynamics: Second Edition}},
    	Year = 2008}
  
    @article{zenodo,
    	Abstractnote = {<p>Gala is a Python package for Galactic astronomy and
        gravitational dynamics. The bulk of the package centers around
        implementations of gravitational potentials, numerical integration,
        and nonlinear dynamics.</p>},
    	Author = {Adrian Price-Whelan and Brigitta Sipocz and Syrtis Major and
        Semyeong Oh},
    	Date-Modified = {2017-08-13 14:14:18 +0000},
    	Doi = {10.5281/zenodo.833339},
    	Month = {Jul},
  