--- /dev/null
+<?xml version="1.0"?>
+
+<!DOCTYPE publication SYSTEM "publication.dtd">
+
+<publication>
+ <title>Categories, Types and Structures. An introduction to Category
+ Theory for the Working Computer Scientist.</title>
+ <author file="bologna/asperti"/>
+ <author>
+ <name>Giuseppe</name>
+ <surname>Longo</surname>
+ </author>
+ <where>Foundation of Computing Series, Massachusetts Institute of Technology
+ Press, ISBN 0 262 01125-5, 1991</where>
+</publication>