remove empty bibliography

content/zettels/granite.md

@@ -17,9 +17,3 @@ Tags
 | [Microplan](https://www.microplan-group.com/fr/) | France      |
 | [Zali](http://zali-precision.it/en/products/)    | Italy       |
 | [Mytri](https://www.mytri.nl/en)                 | Netherlands |
-
-
-## Bibliography {#bibliography}
-
-<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-</div>