Check for missing citations

[drphilmarshall]

We'll need the section authors to make sure that their sections include citations appropriate for a conference proceedings - but would you mind checking the sections for them please, editors? Thank you! Again, please check in when you have completed this task:

• Introduction @drphilmarshall
• Example Observing Strategies @ivezic @yoachim
• Solar System @davidtrilling @rhiannonlynne
• The Galaxy @akvivas @willclarkson
• Variable Objects @AshishMahabal @lmwalkowicz
• Eruptive and Explosive Transients @ebellm @fedhere
• AGN @ohadshemmer @tanguita
• Cosmology @MichelleLochner @egawiser
• Special Surveys @drphilmarshall
• Synergy with WFIRST @jasondrhodes
• Trade-offs @StephenRidgway

[jasondrhodes]

@drphilmarshall is there a quick link that shows the preferred style we should use for references? I did a quick check and didn't see anything in, for example, the readme