rebuild with cite

Author: HumphreyYang

lectures/_static/quant-econ.bib

@@ -3,7 +3,7 @@
 Note: Extended Information (like abstracts, doi, url's etc.) can be found in quant-econ-extendedinfo.bib file in _static/
 ###
 
-@article{north1989constitutions,
+@article{north1989,
   title={Constitutions and commitment: the evolution of institutions governing public choice in seventeenth-century England},
   author={North, Douglass C and Weingast, Barry R},
   journal={The journal of economic history},

lectures/french_rev.md

@@ -140,12 +140,7 @@ during those four wars.
 
 A remarkable aspect of figure {numref}`fr_fig4` is that despite having a population less than half of France's, Britain was able to finance military expenses of about the same amounts as France's.
 
-This testifies to Britain's  having created state institutions that could sustain high  tax collections, government spending , and government borrowing.  See  {cite}`north1989constitutions`. 
-
-
-
-
-
+This testifies to Britain's  having created state institutions that could sustain high  tax collections, government spending , and government borrowing. See  {cite}`north1989`. 
 
 ```{code-cell} ipython3
 ---