feat(dissertation): add vdmj explanation

pub/dissertation/references.bib

@@ -93,13 +93,6 @@
   urldate = {2024-02-23},
 }
 
-@online{vdmj,
-  author = {Nick Battle},
-  title = {VDMJ},
-  url = {https://github.com/nickbattle/vdmj},
-  urldate = {2024-04-21},
-}
-
 @manual{overture-remote,
   author = {Peter Gorm Larsen and Kenneth Lausdahl and Peter Jørgensen and Joey
             Coleman and Sune Wolff and Nick Battle},
@@ -274,6 +267,36 @@
   urldate = {2024-05-14},
 }
 
+@online{vdmj,
+  author = {Nick Battle},
+  title = {VDMJ},
+  url = {https://github.com/nickbattle/vdmj},
+  urldate = {2024-04-21},
+}
+
+@online{vdmj:license,
+  author = {Nick Battle},
+  title = {vdmj/LICENCE at master · nickbattle/vdmj},
+  url = {https://github.com/nickbattle/vdmj/blob/master/LICENCE},
+  urldate = {2024-05-14},
+}
+
+@online{gpl3,
+  author = {{Free Software Foundation, Inc.}},
+  title = {The GNU General Public License v3.0 - GNU Project - Free Software
+           Foundation},
+  url = {https://www.gnu.org/licenses/gpl-3.0.en.html},
+  urldate = {2024-05-14},
+}
+
+@online{gpl3:library,
+  author = {{Free Software Foundation, Inc.}},
+  title = {Frequently Asked Questions about the GNU Licenses - GNU Project -
+           Free Software Foundation},
+  url = {https://www.gnu.org/licenses/gpl-faq.html#IfLibraryIsGPL},
+  urldate = {2024-05-14},
+}
+
 @online{xpc:pom,
   author = {Mike Frizzell},
   title = {Maven Folder Structure Re-org by frizman21 · Pull Request \#227 ·