remove empty bibliography

content/zettels/h_infinity_control.md

@@ -17,9 +17,3 @@ From _Rosenbrock, H. H. (1974). Computer-Aided Control System Design, Academic P
 > Solutions are constrained by so many requirements that it is virtually impossible to list them all.
 > The designer finds himself threading a maze of such requirements, attempting to reconcile conflicting demands of cost, performance, easy maintenance, and so on.
 > A good design usually has strong aesthetic appeal to those who are competent in the subject.
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-## Bibliography {#bibliography}
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-<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-</div>