--- /dev/null
+@incollection{lambdadelta7,
+ author="F. {Guidi}",
+ title="{An Efficient Validation Procedure for the Formal System $\lambda\delta$}",
+ publisher="Centre for Applied Mathematics and Information Technology, Department of Mathematics, University of Azores",
+ address="Ponta Delgada, Portugal",
+ editor="F. {Ferreira} and H. {Guerra} and E. {Mayordomo} and J. {Rasga}",
+ booktitle="Local Proceedings of 6th Conference on Computability in Europe (CiE 2010)",
+ pages="204-213",
+ year="2010",
+ month="July"
+}
+
+@techreport{lambdadelta6,
+ author="F. {Guidi}",
+ title="{Landau's ``Grundlagen der Analysis'' from Automath to lambda-delta}",
+ type="Technical Report",
+ institution="University of Bologna",
+ address="Bologna, Italy",
+ number="UBLCS 2009-16",
+ year="2009",
+ month="September"
+}
+
+@article{lambdadelta5,
+ author="F. {Guidi}",
+ title="{The Formal System $\lambda\delta$}",
+ publisher="ACM",
+ address="New York, NY, USA",
+ journal="Transactions on Computational Logic",
+ volume="11",
+ number="1",
+ year="2009",
+ month="October",
+ pages="Article No. 5"
+}
+
+@incollection{lambdadelta4,
+ author="F. {Guidi}",
+ title="{Lambda Types on the Lambda Calculus with Abbreviations}",
+ publisher="Universit\`a di Siena",
+ address="Siena, Italy",
+ editor="S. {Barry Cooper} and T. F. {Kent} and B. {L\"owe} and A. {Sorbi}", @comment="{\"}",
+ booktitle="Local Proceedings of 3rd Conference on Computability in Europe (CiE 2007) Technical Report 487",
+ pages="387-387",
+ year="2007",
+ month="June"
+}
+
+@techreport{lambdadelta3,
+ author="F. {Guidi}",
+ title="{Lambda-Types on the Lambda-Calculus with Abbreviations}",
+ type="Technical Report",
+ institution="University of Bologna",
+ address="Bologna, Italy",
+ number="UBLCS 2006-25",
+ year="2006",
+ month="November"
+}
+
+@techreport{lambdadelta2,
+ author="F. {Guidi}",
+ title="{Lambda-Types on the Lambda-Calculus with Abbreviations: a Certified Specification}",
+ type="Technical Report",
+ institution="University of Bologna",
+ address="Bologna, Italy",
+ number="UBLCS 2006-01",
+ year="2006",
+ month="January"
+}
+
+@misc{lambdadelta1,
+ author="F. {Guidi}",
+ title="{lambda-delta}",
+ howpublished="Formal specification with the proof assistant \textsc{coq} 7.3.1",
+ year="2007",
+ month="January",
+ note="Available at the lambda-delta Web site: {http://helm.cs.unibo.it/lambda-delta/}"
+}