remove empty bibliography

content/zettels/shaker.md

@@ -21,9 +21,3 @@ Tags
 | [YMC](http://www.chinaymc.com/product/showproduct.php?id=78&lang=en)                        | China     |
 | [Vibration Research](https://vibrationresearch.com/shakers/)                                | USA       |
 | [Sentek Dynamics](https://www.sentekdynamics.com/)                                          | USA       |
-
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-## Bibliography {#bibliography}
-
-<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-</div>