deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 3a57d2b..dbd8315 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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number = {21},  pages = {10765--10777},  author = {J. Messerschmidt and M. C. Geibel and T. Blumenstock and H. Chen and N. M. Deutscher and A. Engel and D. G. Feist and C. Gerbig and M. Gisi and F. Hase and K. Katrynski and O. Kolle and J. V. Lavri{\v{c}} and J. Notholt and M. Palm and M. Ramonet and M. Rettinger and M. Schmidt and R. Sussmann and G. C. Toon and F. Truong and T. Warneke and P. O. Wennberg and D. Wunch and I. Xueref-Remy},  title = {{Calibration of {TCCON} column-averaged {CO}$\less$sub$\greater$2$\less$/sub$\greater$: CO$_2$:  the first aircraft campaign over European {TCCON} sites}}, journal = {Atmospheric Chemistry and Physics},  }