fixed two more links + updated citation

[RemDelaporteMathurin]

Following #1050

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.87%. Comparing base (bd34e7c) to head (0c79b2d).
⚠️ Report is 4 commits behind head on fenicsx.

Additional details and impacted files

@@            Coverage Diff            @@
##           fenicsx    #1052    +/-   ##
=========================================
  Coverage    94.87%   94.87%            
=========================================
  Files           44       44            
  Lines         3100     3296   +196     
=========================================
+ Hits          2941     3127   +186     
- Misses         159      169    +10     

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