remove empty bibliography

content/zettels/reference_tracking.md

@@ -44,9 +44,3 @@ y = lsim(T, r, t); % Output
 The error converges to a constant equal to \\(\frac{r\_v}{\omega\_c} \approx 0.016\\).
 
 The output "lags" behind the reference by \\(\frac{1}{\omega\_c}\\) in seconds.
-
-
-## Bibliography {#bibliography}
-
-<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-</div>