title: Why is the Web Api returning empty json results with "$ref="?
body: <p>I disabled lazy loading and proxy creation in EF5 before returning any results in the Web Api. Everything worked fine. However, when i start to <code>Include()</code> other entities for eager fetching, some of the JSON objects look like this:</p>
  
  <pre><code>{
  $ref: "14"
  },
  .. correct objects ..
  {
  $ref: "6"
  },
  ..
  </code></pre>
  
  <p>What is this <code>"$ref"</code> that gets included in the list of results?</p>