Pass through Coinductive up to PL example

latex/cpdt.bib

@@ -243,3 +243,12 @@
  booktitle = {Proceedings of the 33rd ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages},
  year = {2006},
  }
+
+@TechReport{IT,
+  title =	 "A Tutorial on Recursive Types in {Coq}",
+  author =	 "Eduardo Gim\'enez",
+  year =	 "1998",
+  month =	 may,
+  number =	 "0221",
+  institution =	 "INRIA",
+}