title: How to deal with circular references?
body: <p>If I have those two projects:</p>
  
  <pre><code>MyCompany.ERP.Billing
  MyCompany.ERP.Financial
  </code></pre>
  
  <p><strong>Billing</strong> asks/sends information to <strong>Financial</strong> and vice-versa. Both are too big so I don't want to put them in a single project.
  Visual Studio doesn't allow circular references. How would you deal with that?</p>