add doi link

frozen/praqa.md

@@ -9,6 +9,8 @@ permalink: /frozen/PRAQA/
 
 {% rtitle Protein Relative Abundance Quantification Algorithm for 3D  Fluorescent Images from Tissue %}
 Corrado Ameli, Sonja Fixemer, David Bouvier, Alexander Skupin.
+
+permalink: [doi:10.17881/j20h-pa27](https://doi.org/10.17881/j20h-pa27)
 {% endrtitle %}