Citation for the three state equations.

thesis.bib

@@ -3693,4 +3693,16 @@
   pages     = {262--277},
   publisher = {Springer},
   year      = {2005}
+}
+
+# Three state equations
+@inproceedings{Mellies14,
+  author    = {Paul{-}Andr{\'{e}} Melli{\`{e}}s},
+  title     = {Local States in String Diagrams},
+  booktitle = {{RTA-TLCA}},
+  series    = {{LNCS}},
+  volume    = {8560},
+  pages     = {334--348},
+  publisher = {Springer},
+  year      = {2014}
 }