+% \lambda\delta version 3 (proposed) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+@misc{lambdadeltaJ3a,
+ author="F. {Guidi}",
+ title="{A Verified Translation of Landau's `Grundlagen'' from Automath into a Pure Type System, via $\lambda\delta$}",
+ year="2015",
+ month="February",
+ note="Submitted to JFR, University of Bologna (available at $<$http://lambdadelta.info/$>$)"
+}
+
+% \lambda\delta version 2 (active) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+@misc{lambdadeltaJ2a,
+ author="F. {Guidi}",
+ title="{The Formal System $\lambda\delta$ Revised, Stage A: Extending the Applicability Condition}",
+ howpublished="CoRR identifier 1411.0154",
+ year="2014",
+ month="November",
+ note="Submitted to ACM ToCL (available at $<$http://lambdadelta.info/$>$)"
+}
+
+@misc{lambdadeltaV2,
+ author="F. {Guidi}",
+ title="{lambdadelta\_2}",
+ howpublished="Formal specification for the proof assistant Matita 0.99.2",
+ year="2014",
+ month="October",
+ note="Available at $\lambda\delta$ Web site: $<$http://lambdadelta.info/$>$"
+}
+
+@incollection{lambdadeltaR2b,